建设工程安全生产技术土建类搜答案神器-威尼斯人最新

时间:2024-06-24 08:17:34


part i: choose from the following groups of words the one you hear. each of the words will be read once only.

choose from the following groups of words the one you hear. each of the words will be read once only.

choose from the following groups of words the one you hear. each of the words will be read once only.

choose from the following groups of words the one you hear. each of the words will be read once only.

choose from the following groups of words the one you hear. each of the words will be read once only.

choose from the following groups of words the one you hear. each of the words will be read once only.

choose from the following groups of words the one you hear. each of the words will be read once only.

choose from the following groups of words the one you hear. each of the words will be read once only.

choose from the following groups of words the one you hear. each of the words will be read once only.

choose from the following groups of words the one you hear. each of the words will be read once only.

part ii: the following pairs of sentences are exactly the same except for one word. you will hear either sentence (a) or (b). choose the one you hear.

the following pairs of sentences are exactly the same except for one word. you will hear either sentence (a) or (b). choose the one you hear.

the following pairs of sentences are exactly the same except for one word. you will hear either sentence (a) or (b). choose the one you hear.

the following pairs of sentences are exactly the same except for one word. you will hear either sentence (a) or (b). choose the one you hear.

the following pairs of sentences are exactly the same except for one word. you will hear either sentence (a) or (b). choose the one you hear.

the following pairs of sentences are exactly the same except for one word. you will hear either sentence (a) or (b). choose the one you hear.

the following pairs of sentences are exactly the same except for one word. you will hear either sentence (a) or (b). choose the one you hear.

the following pairs of sentences are exactly the same except for one word. you will hear either sentence (a) or (b). choose the one you hear.

the following pairs of sentences are exactly the same except for one word. you will hear either sentence (a) or (b). choose the one you hear.

the following pairs of sentences are exactly the same except for one word. you will hear either sentence (a) or (b). choose the one you hear.

part iii: the following pairs of sentences are exactly the same, except a different word is stressed (stronger) in each sentence. choose the sentences you hear in each group.

the following pairs of sentences are exactly the same, except a different word is stressed (stronger) in each sentence. choose the sentences you hear in each group.

the following pairs of sentences are exactly the same, except a different word is stressed (stronger) in each sentence. choose the sentences you hear in each group.

the following pairs of sentences are exactly the same, except a different word is stressed (stronger) in each sentence. choose the sentences you hear in each group.

the following pairs of sentences are exactly the same, except a different word is stressed (stronger) in each sentence. choose the sentences you hear in each group.

part iv: listening comprehension: in this section, you are going to listen to hear 10 sentences. please listen carefully and decide which of the sentences in the three choices is closest in meaning to the one you hear.

in this section, you are going to listen to hear 10 sentences. please listen carefully and decide which of the sentences in the three choices is closest in meaning to the one you hear.

in this section, you are going to listen to hear 10 sentences. please listen carefully and decide which of the sentences in the three choices is closest in meaning to the one you hear.

in this section, you are going to listen to hear 10 sentences. please listen carefully and decide which of the sentences in the three choices is closest in meaning to the one you hear.

in this section, you are going to listen to hear 10 sentences. please listen carefully and decide which of the sentences in the three choices is closest in meaning to the one you hear.

in this section, you are going to listen to hear 10 sentences. please listen carefully and decide which of the sentences in the three choices is closest in meaning to the one you hear.

in this section, you are going to listen to hear 10 sentences. please listen carefully and decide which of the sentences in the three choices is closest in meaning to the one you hear.

in this section, you are going to listen to hear 10 sentences. please listen carefully and decide which of the sentences in the three choices is closest in meaning to the one you hear.

in this section, you are going to listen to hear 10 sentences. please listen carefully and decide which of the sentences in the three choices is closest in meaning to the one you hear.

in this section, you are going to listen to hear 10 sentences. please listen carefully and decide which of the sentences in the three choices is closest in meaning to the one you hear.

corporate culture corporate culture is described as the (1) _____________ of an organization, and guides how employees think, act, and feel.

it includes core values and beliefs, corporate ethics, and rules of behavior. it can be expressed in the company’s mission (2) _____________ and other communications,

in the architectural style or interior (3) _____________ of offices, and in the titles given to various employees. corporate culture affects you in many ways.

for instance: l the (4) __________ __________ per day, per week.

the (5) __________ __________, including employee interaction, competition degree, etc.

the (6) __________ __________, including the accepted styles of attire, etc.

the (7) __________ __________ you get, including cubicles, window offices, etc.

the (8) __________ __________ development.

onsite perks, such as break room, play room, etc. l the (9) __________ __________ outside the office.

(10) _____________ with other employers.

part ii. passage (shadowing and gist) directions: listen to the passage and choose the best answer to each of the following questions. what does the speaker really describe in the speech?

irections: listen to the passage and choose the best answer to each of the following questions. how do specialists comment on this study method?

directions: listen to the passage and choose the best answer to each of the following questions. how effectively can the average person learn during sleep as in the same period during the day?

directions: listen to the passage and choose the best answer to each of the following questions. what does sleep-teaching do?

directions: listen to the passage and choose the best answer to each of the following questions. what did the student have to do for another three hours before having breakfast?

part iii. news (shadowing and gist) a. directions: listen to the news item and complete the following summary. this news item is about .

directions: listen to the news item and choose the best answer to complete the following sentences. opposition parties are demanding after a violent protest over voting problems tuesday.

there were at least killed and injured during the voting.

people at more than 100 voting places .

show the ruling general people’s congress party in the lead.

part i (note-taking) directions: listen to a talk about light and health. take notes and complete the following summary. can light affect your health? many researchers believe that light can affect both your physical and your (1) .

from daylight, our bodies absorb vitamin d through the skin. certain skin diseases also (2) from exposure to sunlight.

light absorbed through the eye can stimulate hormone production, which in turn (3) our mood.

some people become (4) in winter, when the days are dark and most people spend less time in the open air.

when spring comes, these (5) disappear. researchers have called this condition sad -- seasonal affective depression.

the condition can be (6) by exposing patients to special lights, known as full-spectrum lights.

this lighting has also been used to treat patients (7) from jet-lag, to improve learning in school-children in russia and america,

and the (8) of japanese factory workers

young people need at least fifteen minutes a day in real daylight in summer (9) in winter.

old people, who risk vitamin d deficiency, should spend even longer exposed to (10) daylight.

peak performances - moments when children (1) that's in them -

are the stuff of every parent's (2) .

and yet most of us have seen a report card or heard a trumpet solo that (3)

what our kids can (4) .

why can some boys and girls repeatedly pull themselves to the (5)

while others of equal or (6) cannot?

many parents assume skill is pretty much determined by (7)

the student with the highest i.q. will get the best grades, or the athlete with the most prowess will (8) .

genes (9) in determining performance, but they're not everything.

the edge comes from mental attitude, character and (10) .

there are some simple ways for parents to help their youngsters develop those (11)

find something to praise. a child who feels good about himself (12)

assess your child's (13)

encourage self-applause. knowing how to relax is key to (14) .

a good report card (15) near your daughter's mirror reminds

her that she can do well and (16) to repeat her success.

there are no (17) to bringing your child to do his best.

it's a (18) of support, encouragement and hard work.

and those efforts (19) not only in peak performance

not only in peak performance but also in (20) between parent and child.

news item from voa, bbc and cri part i directions: listen to the news item and complete the following passage. creating a classroom environment that treats women and men equally is important for the educational success of students. however ____1______ equality does not stop with the teacher.

it is also important that the ____2______ used are supporting _____3_____ treatment.

in fact, many classroom materials, especially those that are older, may contain gender bias in _____4_____, photos, or words.

these materials can include textbooks, _____5_____, reading materials, written assignments, or even test materials.

having students use materials like these in class can reinforce _____6_____ about gender roles in society.

classroom materials that reinforce gender stereotypes can ____7______ students,

weaken their motivation and limit their overall _____8_____ performance.

this can result in fewer opportunities available to students when they finish their schooling. research has found that stereotypes and gender bias in english language materials do _____9_____.

several studies by the united nations educational, scientific, and cultural organization, or unesco, have found that some texts ____10______ women, contain stereotypes about women or offensive comments about women.

in addition, research has found that _____11_____ in teaching materials

often show a male _____12_____.

one study on high school english language textbooks in iran found that male characterizations were used as much as _____13_____ of the time.

one study on high school english language textbooks in iran found that male characterizations were used as much as _____13_____ % of the time.(请填写数字)

the first step is to understand how to identify gender bias in textbooks. examine the image below. these images were taken from an english language textbook. what do you notice about how the men and women are being _____14_____?

in this image there are six people, four men and two women, shown in different jobs. the men pictured include a construction worker, a doctor, a police officer, and a truck driver. the women shown include a farm worker and a food store employee. this image shows men and women in _____15____ jobs in two ways.

first, male representation is double that of female. second, the men generally are working in higher-level, more economically powerful jobs. now look at a short reading activity from an actual english language textbook. what do you notice about the ________ of men and women in the example?

part ii directions: listen to the news item and complete the following passage. a new report says about ___1__ people

a day have been forced to __2__ their homes in african conflict

and __3__ zones.

figures show that more than __4__ people in africa are internally displaced. (请填文字)

nearly __5___left their homes last year.(请填文字)

part iii directions: listen to the news item and complete the following passage. britain's most prestigious ___1___art award,

the turner prize have been won by an art professor who was born in zanzibar, lubaina himid. judges __2___ her work

which explored the african diaspora and black ___3__.

professor himid is the first black woman and the oldest person to win the__4__.

part i listening to a song directions: listen and fill in the blanks with the missing information. although (1) __________ has always been a friend of mine.

i'm leaving my life in your (2) __________.

people say i'm (3) __________

and that i am (4) __________.

risking it (5) __________ in a glance. 

how you got me blind is still a (6) __________.

i can't get you out of my (7) __________

don't care what is written in your (8) __________.

as long as you're (9) __________ with me. i don't care who you are. where you're from. what you did.

why did mr. power ask mr. hanson to call later?

why should the report be photocopied in the morning?

why was mr. power especially displeased about miss davis’s call to her boyfriend?

what do you think of miss wright?

what can you learn from the dialogue?

(dialogue 2:6-10)why has laura come to the office?

who is miss davis?

when do people in the finance section start work?

what do you know about linda?

why does linda feel a little nervous today?

(dialogue 3:11-15) why did the woman come to complain to the manager?

what excuse did the manager make for the problems?

what did the manager promise to do?

what do you know abut the hotel?

what does the dialogue mainly tell us?

part ii passages directions: you're going to hear three short passages. each will be read twice. at the end of each passage, you will hear some questions. choose the best answer to each question. (2 points for each) passage 1 which of the following is true according to the passage?

which of the following would be the best title for the passage?

passage 2 (18-20)why did the artly dressed man come to the jewelry shop one day?

which of the following was of no importance to the man?

what did the old lady take to the jewelry shop?

how much did the shop lose in the deal?

passage 3 (22-25) which of the following is not necessary for a young man who wants to drive alone?

what must a person do in the driving test?

which of the following is mentioned in the passage?

what is this passage mainly about?

第一个提出“社会学”概念并创立社会学的人是( )

社会学产生的直接根源和关键因素是( )

结构功能主义的主要人物是( )

“社会学旨在理解和洞察人类行为的社会意义”,这一说法属于以下哪一流派的 观点( )

强调“身临其境、融入社会、打成一片”的社会学研究资料的收集方法是( )

初次见面的公务式自我介绍一般需要包括以下四个基本要素

握手时

以下不符合上饮料的规范顺序的是

送名片的方式是

自我介绍应注意的有

名片使用中以下描述错误的是

电话通话过程中,以下说确的有

重要会务接待需要注意

在观看演出时不要随意拨打或者接听电话

用餐点菜时,没有必要征求主宾的意见

接过名片,首先要仔细看看

接待多方来访者要注意待客有序

选送鲜花时,不但要看其通用的寓意,而且也看其民俗寓意,二者应并行不悖

在办公地点,接待彼此不相识的来访者可以不用为他人做介绍。

在各种社交场合,涉及对方年龄、健康、经历等话题应忌谈。

在社交场合,“兄弟”、“哥们”等称呼可以随时使用。

现代意义上的沟通,就是人们为着某种交际目的,所进行的信息传递与接受的过程。这种信息可以是

沟通的信息编码是指( ),它是沟通活动得以进行的最基本因素。

( )就是面对面交流的沟通交流方法,上下级之间布置、报告工作,同事之间沟通协调问题,一般都采用这种方法。

以下拒绝上级的做法中,正确的一项是

以下有关同事之间相处的方法中,不正确的一项是

以下选项中属于导致沟通障碍的因素的是

沟通的互动性的特征说明

以下有关沟通的主要因素中说确的项是

以下有关沟通的意义的说法中,正确的是

以下有关上级下级沟通的方法中,正确的选项是

有效的沟通,必须是沟通渠道畅通的信息交流。否则,沟通渠道出现任何障碍,都会影响沟通

沟通,是一种双向的交流活动,缺少了任何一方,都无法实现真正意义上的沟通,这是指沟通的互动性

专业技术人员面对上级时唯唯诺诺、唯命是从才可能赢得赏识和器重,个人前途才会有发展

沟通能力是沟通者思想、知识、思维、心理等素质的体现,是一种综合能力

信息本身的障碍表现为语言障碍、文化障碍、心理障碍、态度障碍等

与他人沟通时,如果你是对的,就要据理力争,大声告诉对方你是对的

沟通不仅贯穿于决策制定的全过程,还贯穿于决策的实施过程

清楚地表达你的观点,并提供支持的理由。认真地聆听他人的意见,努力了解他人的观点及理由。这些做法可以提高自己在团队中的参与性

经常给予能干的下级以关心和肯定,可以给他们带来一种极大的荣誉感和自豪感

所谓经验型思维定式,就是在对事物的认知和对是非的判定上,缺乏自我独立思考的意识,而盲目地依附于权威

你工作一段时间之后,领导和同事都觉得你不适合这个岗位,大家碍于面子没有明说,但是已经暗示过你应该辞职,这时你怎么办?

你组织本单位一些退休老同志乘火车旅游,不巧遇上暴雨,导致前方铁轨塌陷,火车无法继续行驶,要修复至少需要一天时间,而此时有部分老同志由于连降暴雨而身体不适,这时你怎么办?

在处理具体矛盾时,作为领导必须做到( )

所谓( )是指在正式沟通渠道之外的信息传递与交流。

朗诵作品中的发人深省的警句和庄严号召的语言描写时,采用的语速是( )

以下哪种关于职业能力及倾向的表述代表实用型的职业类型?( )

在时间管理技巧中,“把时间用于少数重要的事,以达到事半功倍的效果”,是指( )

( )就是面对面交流的沟通交流方法,上下级之间布置、报告工作,同事之间沟通协调问题,一般都采用这种方法。

以下有关同事之间相处的方法中,不正确的一项是( )。

沟通分为( )和非正式沟通两大类

握手时 ( )

关于赞美的方法,下列表述错误的是:( )

在饭店酒桌上,顾客:“这杯子没有洗净,下面还有手印呢!“如果你是服务员,作何回答?( )

送名片的方式是( )

时间管理的统筹技巧包括( )

在没有特殊情况时,上下楼应 ( )行进

对于座次的描述不正确的有( )

现代意义上的沟通,就是人们为着某种交际目的,所进行的信息传递与接受的过程。这种信息可以是( )。

理解上司是指:( )

组织内部与人相处的法则理解正确的是:( )

在组织沟通中,对说话要点描述正确的是:( )

挨上司骂的时候正确的处理方式是:( )

有些领导“权”与“威”分离的原因是( )

沟通的互动性的特征说明( )

重要会务接待需要注意( )

属于与同事合作五大原则的是( )

提升行政演讲能力的五个基本功包括:语质、 、 、 、语病( )

服务意识是指行政人员在与一切组织利益相关的人或其它组织的交往中所体现的为其提供热情、周到、主动的服务的欲望和意识。( )

沟通只存在于决策制定的全过程,决策的实施过程不需要沟通。( )

用餐点菜时,没有必要征求主宾的意见。( )

在各种社交场合,涉及对方年龄、健康、经历等话题应忌谈。( )

在丹尼尔•戈尔曼提出的六种领导风格中,关系型领导提倡建立情感纽带,创造一种和谐的关系。( )

父母,爱人和孩子等至亲的人一般不需要赞美,此种说法:( )

木桶理论指的是“一个由木块做成的木桶,其盛水量是由最短的木块决定的。提高盛水量的最经济办法是将最短木块加长。” ( )

一般行政职业能力指的是指从事某一特定职业所必备的特殊的或较强的能力。( )

一般职业能力是特殊职业能力的基础( )

时间管理法制中的“abc分类法”的第一步做法是“将自己工作按轻重缓急分为:a(紧急、重要)、b(次要)、c(一 般)三类” ( )

责任落实四步骤16字口诀:“一一计划、环环讲细、步步落实、事事到位” ( )

执行力是完成任务、达成目标的能力。( )

沟通,是一种双向的交流活动,缺少了任何一方,都无法实现真正意义上的沟通,这是指沟通的互动性。( )

与人为善是发展良好人际关系的基础,友好相处,是建立良好同事关系的起点。( )

作为领导,没必要经常给予能干的下级以关心和肯定。( )

行政责任能力一讲中的“三胡”现象指的是胡弄、胡干、胡说。( )

与他人沟通时,如果你是对的,就要据理力争,大声告诉对方你是对的。( )

行政服务能力分为三个层次:为领导服务、为部门服务、为他人服务( )

“和尚分粥”的故事反映了“制度建设是有效执行的根本”。( )

在工作中,为了让自己轻松点,遇到问题绕着走,难处理的事就请示,这种做法是明智的。( )

下列各方程中(仅x、q是时间函数),可表示为简谐振动形式的是

物体做简谐振动,周期为2秒。t=0时,坐标,速度 cm/s。 则简谐振动的振幅a和初相的正切分别为

一系统的振动方程为 m,则它的振幅、角频率和初相分别为

物体做简谐振动,t=0时刻,,并沿正方向运动,则振动的初相为

物体做简谐振动,振幅为a。t=0时刻,,并沿负方向运动,则振动的初相为

质点作简谐振动,周期为t,它由平衡位置沿着x轴负方向运动到最大负位移1/2处所需要的最短时间是

弹簧振子做简谐振动,振动方程为,在下面那个位置,振子的动能和势能正好相等?

图示为两个同频率的谐振动,方程分别为和,则它们的相位差为

有两个完全相同的弹簧振子a和b,并排放在光滑的水平面上,它们的周期都是2s。现将两个振子从平衡位置向右拉开5cm,然后无初速先释放a,经过0.5s,再释放b,则它们之间的相位差为

在相同条件下,敲击一个音叉听到的声音必定小于两个音叉同时振动时在同一位置处所听到的声音。

两个同方向同频率的振动,和,则合振动的振幅和初相分别为

一个质点同时参与两个同方向同频率的谐振动,则质点的振幅分别取最大值和最小值的相位差条件为

两个同方向的谐振动,振动方程分别为 m 和 m,则合振动的方程为

三个同方向同频率的振动,,,,则合振动的振幅为

三个同方向同频率的振动,,,。当时,合振动的振幅等于0。

音乐家利用拍的现象给乐器调音,一小提琴a弦绷得有点过紧,把它对着440hz的标准频率发声时,听到的拍频为,请判断小提琴振动的频率是多少?

一物体沿x轴作谐振动,振幅为0.1m,周期为2.0s,在t = 0时,坐标为0.05m,且向x轴负方向运动,该简谐振动的方程为[ ]。

简谐振动的初位移为0,初速度大于0,则振动的初相为[ ]

一质点作谐振动,频率为,则其振动动能变化频率为[ ]

两分振动的振动方程各为和,则合振动的振幅和初相分别等于 [ ]

[ ] 情况下会产生拍现象。

一质点沿x轴做简谐振动,振动方程为 m,从t=0时刻起,到质点处在处且向x轴正向运动的最短时间间隔为

周期为t的简谐振子,在t'时刻其势能为0,则动能为0的时间序列为

质量为m的弹性谐振子,t=0时刻其动能恰为总能量e的一半,且。当相位变化到3π/4时,该谐振子所受冲量大小为

图示为两个谐振动的x~t曲线,将这两个谐振动叠加,合成的余弦振动的初相为 [ ]

有两个完全相同的弹簧振子a和b,并排放在光滑的水平面上,它们的周期都是2s。现将两个振子从平衡位置向右拉开5cm,然后无初速先释放a,经过0.5s,再释放b,则它们之间的相位差为

弹簧谐振子,振动振幅10cm,当其离开平衡位置6cm时,速度为24cm/s,则振动的角频率等于 [ ]rad/s

一质量为10g的物体做简谐振动,其振幅为24cm,周期4s。当t=0时,位移为24cm。在t=0.5s时,物体的位置坐标和加速度分别为

两个同方向的谐振动,振动方程分别为 m 和 m,则合振动的方程为

图示为一单摆装置。把小球从平衡位置b拉开一小角度至a点。在t=0时刻松手让其摆动,摆动规律用余弦函数表示(以逆时针方向为正方向),在从a到c的过程中,下列说法哪些是正确的

单摆在起始时刻的的状态如图示(a)、(b)、(c)三种,若以单摆的平衡位置为坐标原点,x轴指向右为正,则(a)、(b)、(c)三种情况下单摆的初相依次为

某简谐振动,在t=0时,,,该简谐振动在0时刻的旋转矢量图为

一质点同时参与了三个同方向、同频率的简谐振动,它们的振动方程分别为,,,其合振动的振幅为

[ ]是简谐振动。

试判断下列二简谐振动合成运动的性质,[ ]合振动的轨迹为李萨如图

两个简谐振动x~t曲线如图所示,则两个振动的相位差等于

在弹簧谐振子运动的方向上施加一个大小方向都不变的恒力,则这时的运动仍然为简谐振动,且频率不受恒力的影响。

做简谐振动的弹簧振子,其动能和势能是同步变化的。

对于两个同方向、同频率、同振幅的简谐振动,当相位差为时,合振动的振幅等于0。对于n (>2) 个同方向同频率的简谐振动,,,,,,当相位差时,它们的合振动的振幅也一定等于0,有最小值。k、n均为整数。

关于机械波下面几种说法,哪些是正确的?

以一固定的频率振动一根拉紧绳子的一端,在绳子上形成一列横波,若增大绳子内部的张力,则下列哪些说法是正确的?

一列平面简谐波沿x轴正方向以波速 u 传播,已知坐标原点处质点作谐振动的振幅为a、角频率为、位移~时间曲线如图所示。则坐标原点处的振动方程以及平面简谐波的波函数分别为



一平面简谐波某一时刻的波形如图,此波以波速 沿着 x 轴正向传播,振幅为 a,频率为。若以图中b点为x轴坐标原点,从此时刻开始计时,则此波的波函数为

传播速度为100m/s、频率为50hz的平面简谐波,在波线上相距为0.5m的两点之间的相位差是

一平面简谐波沿着x轴负方向传播,波速为u,已知坐标为处的质点的振动方程为,则平面简谐波波函数为

一平面简谐波某一时刻的波形如图,此波以波速 沿着 x 轴正向传播,振幅为 a,频率为。若以图中d点为x轴坐标原点,从此时刻开始计时,则此波的波函数为

一平面简谐波在弹性介质中传播,某时刻介质中某个质元处在负的最大位移处,则在该时刻该质元

一平面简谐波在弹性介质中传播,质元的势能和其形变情况有关。质元的最大形变发生在

一平面简谐波在弹性介质中传播,某质元从最大位移处向平衡位置运动的过程中,下面哪些说法是正确的?

通过振动一根被拉紧绳子的一端,使其沿绳子传播一列简谐波,如果要使得波的强度增大,你将会采取哪些措施?

在介质不吸收波能量的情况下,球面波和平面波一样,各处的振幅都相等。

惠更斯原理能够解释波的传播、反射、折射和绕过障碍物传播的现象,也可以解释波经过狭缝、小孔后出现的衍射条纹。



两振幅相等的相干波在空间相遇,由干涉加强和相消的条件可得出在相互加强处,合成波强度是其中一列波的强度的2倍。

两振幅相等的相干波在空间相遇,由干涉加强和相消的条件可得出在相互加强处,合成波振幅是其中一列波的振幅的2倍。

s1和s2是两相干波源,初相相等,它们发出波长为的相干波,在介质中传播相遇而干涉,已知两波源s1和s2相距,则它们在二者中垂线上任一点p1和连线上任一点p2,分别是是干涉相长还是干涉相消?

s1和s2是两相干波源,初相差为 π,它们发出波长为的相干波,在介质中传播相遇而干涉,已知两波源s1和s2相距,则它们在二者中垂线上任一点p1和连线上任一点p2,分别是是干涉相长还是干涉相消?

两相干平面简谐波,振幅都是a,沿同一方向传播,相位差为,则合成波的振幅是

s1和s2是两相干波源,相距,波长为,设两波各自在 连线上各点的振幅都是a,并且不随距离变化。已知在两波源连线上s1左侧各点的合成波的强度为其中一列波强度的4倍,则两波源的相位差

在一条弦线上形成驻波后,处在相邻波节间且相距为的两个质元的相位差为

在一条弦线上形成驻波,当所有质元都达到正的或负的最大位移时,关于能量[ ]的说法是正确的。

已知驻波波函数为,则波节和波腹的坐标 分别为

已知入射波波函数为,在 处被波密介质反射,则反射波的波函数为

一声源,其振动频率为1000hz,当它以20m/s的速度向静止的观测者运动时,此观测者测到的声波的频率等于多少?声波速度为340m/s.

一声源,其振动频率为1000hz。声源静止,而观测者以20m/s的速度向静止的声源运动时,此观测者测到的声波的频率等于多少?空气中声速为340m/s。

火车a行驶速率为72km/h,汽笛发出声波的频率为800hz,迎面驶来的另一列火车b的速率90km/h,问火车b上的司机听到火车a汽笛声的频率是多少?空气中声速为340m/s。

一汽笛发出频率为1000hz的声波,并以10m/s的速率离开你而向着一悬崖运动,静止的你听到的从悬崖反射回来的声波的频率是[ ]。设空气中声速为330m/s。

一汽笛发出频率为1000hz的声波,并以10m/s的速率向着一悬崖运动,随着汽笛一起运动的观测者听到的从悬崖反射回来的声波的频率是[ ]。设空气中声速为330m/s。

两潜艇在静海水演习,相向而行。甲艇速率为50.0km/h,乙艇速率为70.0km/h。甲艇向乙艇发出声纳信号(水中声波),频率为1000hz,波速为5480km/h。甲艇收到乙艇反射回来声纳信号的频率是[ ]. (提示:第一个过程,甲发信号乙接收;第二个过程,乙反射信号甲接收,乙相当于波源,且它的频率是第一个过程接收到的波的频率)

下列波动方程中,[ ] 波速最大。

已知一平面简谐波的波函数为(a、b为正值),则

传播速度为100m/s、频率为50hz的平面简谐波,在波线上相距为0.5m的两点之间的相位差是

一平面简谐波沿x轴负方向传播,其振幅a=0.01m,频率,波速u=330m/s。若t=0时,坐标原点处的质点达到负的最大位移,则此波的波函数为

一平面简谐波在弹性媒质中传播,若媒质中某质元正处于平衡位置处,则此时该质元

一平面简谐波在弹性媒质中传播,在某媒质质元从最大位移处回到平衡位置的过程中,下列哪些说法是正确的。

在下列的平面简谐波的波函数中,选出一组相干波的波函数[ ]

试判断两列平面间谐波合成的性质,[ ]中两列波合成后可以形成驻波。

在一条弦线上形成驻波,当所有质元都达到它们各自的平衡位置时,关于能量[ ]的说法是正确的。

在一条两端固定且长度等于l的弦线上形成驻波,波长必须要等于

当观察者向着静止的波源运动时,观察者接收到的波的频率大于波源振动的频率,原因是[ ]。

当波源向着静止的观察者运动时,观察者接收到的波的频率大于波源振动的频率,原因是[ ]。

一汽笛发出频率为1khz的声波,观测者以10m/s的速率靠近静止的汽笛,观测者听到的从汽笛传来的声波的频率为[ ]。空气中的声速为330m/s。

一观测者站在铁路旁,听到迎面驶来火车汽笛声音的频率为440hz。火车驶过他的身旁之后,听到汽笛声音的频率变为了392hz。求火车的行驶速度为多少?空气中的声速为330m/s。

波源的振动方程为 m,它所激起的平面简谐波以2.0m/s的速度在一条直线上传播,则沿着传播方向距离波源6.0m处质点的振动方程为

处于x=-6m处的波源,其振动方程为 m,它所激起的平面简谐波以2.0m/s的速度沿着x轴正方向传播,则波函数为

波源的振动方程为 m,它所激起的平面简谐波以2.0m/s的速度在一条直线上传播,若以波的传播方向为x轴正方向,以波源作为坐标原点,则波函数为

设入射波的波函数为,在原点处发生反射,反射点为固定端。则反射波的波函数为[ ]。(提示:反射点固定不动,波被反射时有半波损失)

一列沿着x轴负向传播的平面简谐波,t=0时的波形曲线如图所示,则a处的初相为

[ ]是平面简谐波波函数。

两列相干机械波,波源振动的相位差为π,发出的两波在空间某点p相遇,若两波源到点p的距离之差为波长的整数倍,则p点的振动加强。

一条弦线上驻波形成后,任取两个振动的质元,它们的相位差或者为0,或者为π。

如何重新理解《1984》为代表的反乌托邦三部曲?

请同学们选择一部美剧,选取其中的某一集,简析在其中体现了何种意识形态,又是如何体现的? (具体剧目同学们可以根据自己的熟悉程度任选,供参考的有《摩登家庭》第一季第一集,《黑色代码》第一季第七集)

在本章节的学习之后,请谈谈你对于山寨的理解以及如何看待山寨产品或山寨文化?

请同学们观摩影片《完美陌生人》(或《来电狂响》),结合日常生活经验,试分析在影片和现实生活中,手机及社交媒体是如何建构、维系亲密关系的,又是否对于亲密关系而言是一种威胁?

请同学们选择课程中涉及到的以下经典理论之一,结合实际生活,谈谈你对这一理论的理解与看法。(创新与扩散、使用与满足、沉默的螺旋、议程设置)

ag–agcl参比电极的电极电位取决于电极内部溶液中的( )。

待测离子的电荷数越大,测定灵敏度也越低,产生的误差越大,故电位法多用于低价离子测定。

电位测量过程中,电极中有一定量电流流过,产生电极电位。

晶体膜电极具有很高的选择性,这是因为晶体膜只让特定离子穿透而形成一定的电位。

ph玻璃电极的膜电位产生是由于测定时,溶液中的( )。

ph玻璃电极玻璃膜属于( )。

在利用库仑分析法对物质进行分析的过程中需要基准物质和标准溶液。

在库仑分析法中,若待测物质的摩尔质量为m,通过电解池的电量是96487c,则根据法拉第定律,在阴极上析出的物质的量应为m。

在法拉第电解定律的表达式中,不包含下列的( )。

库仑分析不适合微量物质的分析。

库仑分析法是通过测定电解析出物质量来进行分析的。

扩散电流的大小与汞柱高度的关系是( )。

在电化学分析中溶液不能进行搅拌的方法是( )。

半波电位是否为定值与下列因素( )无关。

单扫描极谱灵敏度比经典极谱高的原因是峰电流比极限扩散电流大。

循环伏安法中,通过比较阳极峰电流和阴极峰电流判断电极反应的可逆性。

单扫描极谱中峰电流的大小与扫描速率的关系是( )。

区别n→π*和π→π*跃迁类型,可以用吸收峰的( )。

苯甲醛在250 nm左右是下列哪个吸收带( )。

在苯胺的紫外光谱中,λmax= 230 nm(εmax= 8600)的一个吸收带属于( )。

某芳香化合物产生两个紫外吸收谱带分别为λmax = 211 nm(εmax= 6200)和λmax= 270 nm(εmax=1450)。如果在碱性条件下测定两个谱带分别红移到 λmax=236 nm(εmax= 9400)和λmax= 287 nm(εmax= 2600)。该化合物是 ( )。

某化合物在正己烷中测得λmax= 305 nm,在乙醇中测得λmax= 307nm,该吸收是由下列哪种跃迁所引起的( )。

某化合物分子式为c5h8o,在紫外光谱上有两个吸收带:λmax= 224 nm(εmax= 9750);λmax= 314 nm(εmax= 38);可能的结构是( )。

紫外光谱仪的基本组成按光路流程为光源、样品池、单色器、检测器、数据处理器。

单光束紫外光谱仪不适合扫描吸收曲线。

双光束仪器与双波长仪器的区别是,后者有2个单色器。

在红外光谱中, 的伸缩振动吸收峰出现的波数(cm-1)范围是( )。

下列化学键的伸缩振动所产生的吸收峰波数最大的是( )。

某种化合物,其红外光谱上3000~2800 cm-1,1450 cm-1,1375 cm-1和720 cm-1等处有主要吸收带,该化合物可能是( )。

不考虑其他因素的影响,下列羰基化合物νc=o伸缩频率的大小顺序为:酰卤 >酰胺 >酸 >醛 >酯。

羰基化合物①rcor、②rcoci、③rcoh、④rcof中,c=o伸缩振动频率最高的是( )。

下列化合物νc=o频率最大的是( )。

核磁共振波谱中对比och3、cch3和nch3三个基团,nch3的质子化学位移最大。

苯环和双键氢质子的共振频率出现在低场是由于π电子的磁各向异性效应。

在核磁共振波谱分析中,当质子核外的电子云密度增加时( )。

核磁共振波谱中出现的多重峰是由于邻近核的核自旋相互作用。

化合物ci2c h—ch2ci的核磁共振波谱中,h的精细结构为三重峰

下列化合物中,在核磁共振波谱中,出现单峰的是( )。

室温时,大多数分子处于三重态。

化学发光是基于电磁辐射吸收原理的分析方法。

通常情况,荧光光谱的形状随激发波长的改变而改变。

电子激发态的多重度用m = 2s 1表示,s为电子自旋量子数的代数和。

苯、萘、蒽中荧光量子产率最小的是苯。

icp-aes灵敏度高,可以检测大多数非金属。

由于原子蒸气中基态原子比激发态原子数多得多,所以原子发射法往往比原子吸收法具有较高的灵敏度。

原子发射光谱分析中,浓度较高时容易产生正误差。

几种常用原子发射光源中,产生自吸现象最小的是icp。

原子发射光谱的分析对象主要为非金属元素。

在aas分析中,如果待测元素与共存物质生成难挥发性的化合物,则会产生正误差。

空心阴极灯能够发射待测元素特征谱线的原因是由于其阴极元素与待测元素相同。

在aas分析中,采用标准加入法定量可最大限度地消除基体影响。

原子吸收光谱分析中,通常采用塞曼效应消除化学干扰。

原子吸收光谱定量公式为赛博罗马金公式。

在色谱法中,调整保留值实际上反映了哪些部分分子间的相互作用?

在色谱中,直接表征组分在固定相中停留时间长短的保留参数是( )。

色谱半峰宽,是指:

衡量色谱柱柱效能的指标是

衡量色谱柱选择性的指标是

相邻两组分能否分开取决于

固定液液膜影响柱效,所以液膜一般

担体粒径影响柱效,所以粒径一般

分离度是指相邻两峰分开的程度,所以分离度要求一般

用色谱法进行定量分析时,要求混合物中每一个组分都出峰的是

在色谱法中,用于定量的参数是

对内标物的描述,哪个说法是错误的?

对外标定量方法,哪个说法是错误的?

试指出下列说法中,哪一个不正确?气相色谱法常用的载气是

气相色谱不需要控制温度的部件是

毛细管气相色谱法分析,采用氢火焰离子化检测器,使用的尾吹气是

在使用热导池检测器时,为了检测灵敏度,下列哪个说法是错误的?

在使用热导池检测器时,为了提高检测器的灵敏度,常使用的载气为

下列诸因素中,对热导池检测器灵敏度无影响的因素是

采用氢火焰离子化检测器,氢气和空气流量的比一般为

采用电子捕获检测器,适合做溶剂的有机物是

采用氢火焰离子化检测器,能产生灵敏信号的是

在气液色谱中,色谱柱使用的上限温度应该

在气液色谱中,为了改变柱子的选择性,可以进行如下哪种操作?

在气相色谱中,气化室的温度应该

在气液色谱中,为了改善分离,下列哪个说法不妥?

液相色谱梯度洗提的目的是改变

紫外检测器是

荧光检测器是

示差折光检测器是

电导检测器是

离子色谱通常采用的检测器是

液相色谱流动相的选择,应考虑的问题不包括

离子色谱测定阴离子时,抑制柱用

离子对色谱分离的机理是

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