医学考试题目(新)试题答案搜索软件-威尼斯人最新

时间:2024-06-24 08:22:22


引言部分的写作要点是: a 总结全文 b 提供有关背景信息,引起读者的关注 c 引入文章主题,表明主题展开方向 d 语言简洁明快,文字生动有趣

what are the features of narration? a it is usually told chronologically. b it may use dialogues. c it has a beginning, middle and ending. d it describes something vividly

when making a description, chiefly we will use sight, but to some extent we may also be able to use_________. a hearing b touch c ell d running

the most important quality of exposition (说明文) is ______. a clarity b vividness c reason d affect

a directional process essay tells the reader how to do or make something. a 正确 b 错误

cause-and-effect essays focus on either the causes of something or the effects after something has happened. a 正确 b 错误

what are the patterns to organize a comparison and contrast essay? a subject by subject. b point by point. c time by time. d place by place.

the purpose of argumentation is to convince. a 正确 b 错误

the most important quality of exposition (说明文) is ______

the purpose of argumentation(议论文) is to ________.

what are the features of narration (记叙文)?

to make a description (描写文) vivid, we should use as many senses as possible such as _______.

英语短文中表示总结归纳的衔接词有_____

in the conclusion of the essay, the thesis statement is reaffirmed.

before writing the essay, we should make an outline and have a clear structure of the essay.

引言部分位于文章的开头,在全篇文章中所占比例较小。

英语短文通常包含三个组成部分:引言、主体、____ (结尾/过渡)。

when writing a narrative essay, remember that you are sharing some emotional details with _______ (readers/writers).

in the lecture, what are the adjectives used to replace the word "good" when discribing a good teacher ?

how to improve your sentence level?

how many grammatical problems are mentioned in the lecture?

how many types of transition words are mentioned in the lecture?

what does a paragraph consist of?

what does swb represent?

the minor supporting sentence is less important than the main supporting sentence.

yesterday night, i played with my friends.

last night, i hanged out with my friends.

it was raining a little bit outside.

it had all rain outside.

i turned my phone off.

i closed my phone.

i went to wc.

i went to the restroom.

i went to buy a coffee.

i went to buy the coffee.

coffee wakes me up.

coffee makes me wake up.

we shared the cost.

we split the bill.

1.julie buys a cup of coffee at the newsstand. _____(so/then), she goes to work.

2.tom got into a car accident. ______(furthermore /as a result), his insurance rate increased.

3.michael is very athletic and plays on the school basket team.______(however/in addition), his brother just stays at home and plays video games all day.

4. there are many occupants today, _____(such as / for example), you can become a doctor, engineer, teacher, artist, athlete, musician, or chef, just to name a few.

5. get a college degree is important. _____(in conclusion/ more importantly), building a good network of friends is crucial to future success.

6.hawaii is a beautiful place to live. _____(in addition/ on the contrary), afghanistan is a very inhospitable location.

7. eating well will help you live a healthier life.______(moreover/as a result), exercising every day is also highly recommended.

what categories can letters be ided into? a.personal letters b. social letters c. notes d. business letters

what elements can make your resume stand out? a. highlight your advantages b. have a healthy lifestyle c. break the task into parts d. have wonderful appearance

which is not true according to the following dos' choices ? a. write directly and in a straightforward manner b. make a catalog of achievements c. evaluate and explain the value and meaning of your experience d. write well and correctly

proper addressing not only creates a positive relation with the audience, but also builds a good self-image.

poster is a kind of ( ) with the nature of announcement, which mainly used to advertise the news about plays, movies, performances, football matches, presentations, and so on. a. letter b. agreement c. notice d. argument

1. which is not true according to the following dos' choices in personal statement? a. write directly and in a straightforward manner b. make a catalog of achievements c. evaluate and explain the value and meaning of your experience d. write well and correctly

poster is a kind of ( ) with the nature of announcement, which mainly used to advertise the news about plays, movies, performances, football matches, presentations, and so on. a. letter b. agreement c. notice d. argument

what elements can make your resume stand out? a. highlight your advantages b. have a healthy lifestyle c. break the task into parts d. have wonderful appearance

for the main body part to a letter, we usually start with salutation。

proper addressing in a campaign speech not only creates a positive relation with the audience, but also builds a good self-image.

大学英语四、考试作文部分题目类别包括提纲作文、话题作文、格言作文、图示作文、书信作文和其他作文。

大学英语四、考试作文部分评分标准共分为四个档次。

提纲作文在写作时,三个段落依次围绕题目要求中所列出的提纲来写即可。

本节范文中使用的“vicious competition”表示“公平竞争”。

话题作文在写作时,第一段引言部分要引入话题,直接表明观点。

本节范文中使用的“commonplace”表示“司空见惯的”。

格言作文在写作时,第一段引言部分要解释名言,并表明观点。

本节范文中使用的“utmost importance”表示“不重要”。

图示作文在写作时,第一段引言部分要描述漫画或图表,并引出话题。

本节范文中使用的“controversial”表示“有争议的”。

书信作文在写作时,可以不用注意格式。

书信作文在写作时,最后一段作为结束语,一定不要忘记表达客气,并送上祝福。

无论是什么类别的作文,在写第一段引言部分都要开门见山,点明主题。

本节范文中使用的“spring couplets”表示“春联”。

大学英语考试作文部分要求能在半小时内写出150词以内的短文。

本节范文中使用的“give priority to”表示“优先考虑”。

suppose you have two options on how to go on your tour: one is to go on a package tour and the other is to go a self-guided tour. you are to make a choice. write an essay to explain the reasons for your choice. 根据题目要求,该篇作文属于

you are allowed 30 minutes to write a letter to offer your suggestions to your cousin who sought your advice on how to make his resume distinctive. 根据题目要求,该篇作文属于

大学英语四、考试作文部分考核的技能包括

大学英语四、考试作文部分题目类别包括提纲作文、话题作文、格言作文、图示作文、书信作文和其他作文。

大学英语四、考试作文部分评分标准共分为四个档次。

图示作文在写作时,第一段引言部分要描述漫画或图表,并引出话题。

书信作文在写作时,可以不用注意格式。

无论是什么类别的作文,在写第一段引言部分都要开门见山,点明主题。

大学英语考试作文部分要求能在半小时内写出150词以内的短文。

话题作文的写作思路包括: ;分析原因,提供论据;总结上文,强调观点。

图示作文的写作思路包括:描述漫画/图表,引出话题;表明观点,提供论据; 。

which of the following item matters most to a public speaker?

fundamentally, english public speaking skill will help you ____________________________________.

both the speaker of a casual conversation and that of a public speech need to _________________________________.

which of the following four items are the qualities a good public speaker should acquire?

which of the following statement about english public speaking is true?

public speaking anxiety is a sign of psychological weakness.

you look more nervous to your audience than you actually feel.

with proper training, public speaking anxiety can be reduced.

the more familiar you are with your speech, the less nervous you may feel.

one should memorize every sentence of his or her speech.

choose a topic that you have been studying for years, one about which you could give a speech without any discomfort. this is the best way to acclimate yourself to public speaking within your moral and academic arena.

you may choose a topic which you have some knowledge but not enough to prepare a speech without further research.

read and copy the internet and professional publications to learn about the latest developments in the area you will discuss.

most of the time, the best way to approach topic selection is to pick a single unifying message that you want to deliver and then scour your brain for amazing experiences that add emotional depth to the logical argument of your message.

when you have a real message in your head or heart – an inner urge to speak- you are almost sure to do yourself credit.

which of the following features the most common structure of a speech?

which of the following is essential before you move into the body of your speech?

which of the following patterns is most frequently used to organize the main points in a speech?

if you want to show how the occurrence of one thing is a direct result of another thing, which pattern is probably the most effective?

which of the following is essential before you end your speech?

1. gaining the audience attention is the most fundamental function of an introduction.

2. a speaker can establish his or her credibility by quoting from an expert.

3. a rhetorical question expects immediate verbal response from the audience.

4. a speaker needs to make an apology when he or she doesn’t behave very confidently.

5. greeting the audience in the beginning of a speech may help the speaker release from stage fright.

which of the following belongs to the general types of speech?

which of the following can be a good topic for an informative speech?

which one of the following speech topics belongs to a different type of speech from the others?

causal order is often used to explain the _______ of something.

if you want to introduce the procedures of making a dish, you’d better choose _________ to organize your speech.

which is not the general steps of ending a speech?

which of the following is the method of ending your speech?

which is correct about dramatic statement?

which of the following statement is correct?

what is not the benefits of an effective ending in public speaking?

which of the following is not categorized as factual statements?

what kinds of information do you need to support your points in a speech?

which of the following printed sources is probably most useful for recent topics or latest information?

which of the following is a concern when you use newspaper articles as references for your speech?

what are the criteria to evaluate the reliability of information for your research?

which of the following is not an informative speech?

when you speak to inform, your aim is to _____ .

which one of the following criteria is not frequently used to judge informative speeches?

speeches about objects convey information about any nonhuman material things and about people, focusing on real or fictional iniduals who are living or dead. which one of the following is a speech about objects?

which of the following is an informative speech ?

which of the following is the definition of events?

which of the following is not the principle of writing your purpose statement?

which of the following is incorrect about visual aids?

which of the following is rhetorical devices?

which of the following is not the procedure of making an informative speech?

by ogical reasoning, which of the following war strategy can be used to reason that market dominance is the key to business success?

in what way is the following argument constructed? reality shows send a bad message and help to create a cult of instant celebrity. they are typically built about shameless self-promotion, based on humiliating others and harming relationships for the entertainment of each other and the viewers at home. these programs suggest that anyone can become famous just by getting on tv and "being themselves", without working hard or having any particular talent. kids who watch these shows will get the idea that they don't need to study hard in school, or train hard for a regular job. so this house would clamp down the number of reality shows broadcast on satellite television channels.

of the motion that “capital punishment should be banned”, which of following claims is reasoned by principle?

in what way is the following argument constructed? there is nothing wrong with judging people primarily on their physical prowess. people do this all the time in competitive sport, where fitness and strength are major determinants of success. every competition, of every kind, values certain qualities over others. we recognize that being able to lift heavy weights isn’t the prime definition of human worth, but we can still give prizes for weightlifting. similarly, we can give a prize to a beautiful woman for her beauty without implying that beauty is all that matters about anyone.

which reasoning method is applied in the paragraph below? even before the internet was conceived, plato talked about the evils of anonymity and its effect on human behavior. he said that the ring, which granted its wearer invisibility, would cause even the most just man to behave in an unjust manner and violate the law. this is the same harm that the unaccountability of internet anonymity allows.

in an impromptu speech, the speaker should respond appropriately to the audience, the topic, and the time constraints.

during your life time, the vast majority of your public speaking will be impromptu; every day you will be asked to present your thoughts and feelings during informal or formal situations.

in an impromptu speech, your goal is to have everything laid out perfectly; try not to spontaneously generate words that will help your audience understand what you are talking about.

at some point in your life, your may be asked to speak with a very short notice. speak fast while taking time to organize ideas. begin with an introduction that put yourself and your audience at ease.

impromptu speaking reinforces all aspects of good public speaking: quick thinking, sound argumentation, strategic word choice, and engaged delivery.

研究数据结构就是研究( )。

关于算法的说法,错误的是( )。

数据的( )包括、线性、树和图4种基本类型。

数据的存储结构包括顺序、链式、散列和( )4种基本类型。

na2s2o3·5h2o,俗称海波、大苏打,易溶于水,难溶于酒精。

na2s2o3·5h2o遇酸容易分解,有较强的氧化性和配位能力。

本次实验用到的固液分离方法有:常压过滤、减压过滤及倾泻法。

本次实验涉及的操作主要有:称量、加热、冰水冷却、结晶、固液分离。

化学分析的“碘量法”中,利用反应i2 2s2o32-→s4o62- 2i-定量测定碘。

1. 本次课讲到的常用固液分离方法有几种?方法的名称是什么?

硫粉不易与水浸润,应采用什么办法使其易与na2s2o3溶液反应?

简述硫代硫酸钠主要化学性质及用途。

[cocl(nh3)5]cl2的水合反应方程可以按______级反应处理。

分光光度计实际测得的吸光度a是_____

设计实验时不能直接将co2 氧化为co3 的原因是_____

以下不是过氧化氢作为氧化剂的优点的是____

调节分光光度计时,将波长选择在550nm处是因为_____

实验中加入氯化铵的目的?

如何计算a∞ ?

过滤后可否用大量水洗涤制备得到的[cocl(nh3)5]cl2沉淀?为什么?

在试管中取少量三草酸合铁(ⅲ)酸钾,加蒸馏水溶解,再加入饱和酒石酸氢钠 1ml,充分摇动试管(可用玻璃棒摩擦试管内壁后放置片刻),生成酒石酸氢钾白色晶体,说明

在制备三草酸合铁(ⅲ)酸钾时,中间产物有草酸亚铁,实验中如何除去草酸亚铁的?

实验中得到黄色fec2o4·2h2o沉淀,接下来如何处理

本实验采用的方法是首先由硫酸亚铁铵与草酸反应制备草酸亚铁,在这个步骤中,哪个物质不是产物。

请写出本实验三草酸合铁(ⅲ)酸钾的制备总反应式。

配合物磁化率的测定,选用的标准物质为

下列原子或离子中,_________具有反磁性。

测定某化合物磁矩为5.9(b)m.,那么该化合物未成对电子数为

外轨型配合物,磁矩一定不为0;内轨型配合物,磁矩不一定为0。

在测定配合物磁化率时,样品管可以多准备几根,分别装入待测物和标准物质,这样可以节省实验时间。

在向空样品管加入药品时应该注意什么?

物质的有效磁矩与未成对电子的关系?

k3[fe(cn)6]和k4[fe(cn)6]的轨道杂化类型相同,但前者为顺磁性物质,而后者为反磁性物质。你能指出轨道杂化类型,并解释磁性吗?

下列各酸中,属于二元酸的是______。

向下列溶液中加入硝酸银溶液,析出白色沉淀的是______。

下列物质中是一元酸且具有较强还原性的含氧酸是______。

从节约成本和安全角度考虑,生产nah2po4,na2hpo4和nao4时都可以用na2co3代替naoh与ho4反应。

制备na4p2o7•10h2o时,若将na4p2o7溶液加热煮沸,得到的不是na4p2o7•10h2o而是nah2po4。

以ho4 和na2co3为原料制备na2hpo4,称取的na2co3是否应该完全加入到ho4溶液中?应加入多少na2co3为宜?

下列物质碱性最强的是 。

利用锡箔鉴定sb(ⅲ)利用了sb(ⅲ)的 。

下列关于nabio3的说确的是 。

铬黄的成分是 。

pb(oac)2俗称铅糖,它是易溶弱电解质。

pbi2金黄色难溶固体,可与ki浓溶液反应生成易溶的配合物。

用淀粉-碘化钾试纸检验氯气时,试纸先变成蓝色,但在氯气中时间较长时,蓝色褪去,为什么?

在氧化还原反应中,能否用硝酸、盐酸作为反应的酸性介质?为什么?

怎样配制氯化亚锡溶液?

h2o2不具备的性质是 。

s2o32- 具有还原性,与碘水反应生成s4o62-,与氯水反应生成so42-

na2s2o3·5h2o遇酸容易分解,有较强的还原性和配位能力。

利用棕色环实验鉴定no3-时,从始至终要使反应物混合摇匀。

no2-具有氧化性、还原性和易分解等特性。

鉴定s2o32-的方法主要有两种,写出鉴定反应的离子方程式。

19-20世纪,现代医学发展过程中逐渐形成了临床医学(clinical medicine)、预防医学(preventive medicine)、基础医学(basic medicine)三大分支。

全球死因三大主要疾病依次是缺血性心脏病,脑卒中、慢性阻塞性肺疾病。因此整治慢性非传染性疾病成为现代医学以及内科学的首要任务。

医学思维的演变:从经验医学到循证医学;从整体医学、分支医学到心理-社会-生物医学模式。:

支气管哮喘是多种炎性细胞参与的气道慢性炎症,临床表现为反复喘息、呼气性呼吸困难等症状,多数患者虽经治疗仍不能缓解;

支气管哮喘是支气管粘膜的慢性非特异性炎症,临床表现为反复喘息、吸气性呼吸困难等症状,多数患者可自行或经治疗后缓解

支气管哮喘是多种炎性细胞参与的气道慢性炎症,临床表现为反复发作性的喘息、呼气性呼吸困难等症状,多数患者可自行或经治疗后缓解

主要作用于β2肾上腺素能受体的支气管解痉药是

对严重的支气管哮喘发作病人,重要的祛痰方法

下列哪项不属于vte发生的原发性危险因素

有关pte患者心电图检查的叙述,哪项是错误的

对某一例急性pte患者进行查体,下列哪一项体征不大可能出现

对于大多数pte患者而言,溶栓是最主要的治疗方法

肺循环和呼吸功能障碍是pte主要的临床和病理生理变化

关于p波的阐述,下列哪一项不正确:( )。

关于p-r间期的阐述,下列哪一项不正确:( )。

关于正常人qrs波群的阐述,下列哪一项不正确:( )。

正常人在v5、v6导联,不应出现哪种qrs综合波型?( )

在正常人心电图指标中,下列哪一项不正确?( )

关于正常q波的阐述,下列哪项不正确?( )

关于st段的阐述,下列哪一项不正确?( )

关于t波的阐述,下列哪一项不正确?( )

关于q-t间期,下列哪一项阐述不恰当。( )

心率越快,q-t间期越长。

关于肝硬化腹水形成的因素,不正确的是:

男,65岁。大量饮酒30年,临床诊断肝硬化失代偿期。对评估病情最重要的临床表现是:

肝硬化大量腹水有可能振水音阳性。

肝硬化患者一次排放腹水3000ml而无尿,应考虑肾前性肾衰竭。

消化内镜包含哪几个重要发展阶段

消化内镜诊断技术主要体现在哪几个方面

消化内镜中胃镜检查的禁忌症有哪些?

胶囊内镜和小肠镜的使用,消除了消化道检查的盲区

esd和emr都是消化道早癌的内镜下治疗技术

胃食管反流病患者常有反流表现,该症状通常发生于

胃食管反流病的并发症不包括

难治性gerd是采用双倍剂量ppi治疗至少12周,反流和(或)烧心等症状无明显缓解

慢性肾衰竭需要肾脏替代治疗的指征是

慢性肾衰竭最常见的死因是

慢性肾衰竭的治疗不当的是

肾性骨病早期最可靠的诊断标准是

高蛋白饮食可加重肾小球高滤过状态,促进肾小球硬化。

慢性肾衰竭可导致雌激素、雄激素水平降低

血液透析是最佳的肾脏替代治疗方法。

诊断肾病综合征必须具备的条件是

属于原发性肾病综合征常见的病理类型是

肾病综合征最常见的并发症是

缺铁性贫血是最常见的贫血

正常人体每天排出铁的量平均为

用铁剂治疗缺铁性贫血,疗效表现最早为

原发免疫性血小板减少症治疗首选

下列哪项不符合原发免疫性血小板减少症(itp)的描述( )

原发免疫性血小板减少症(itp)的诊断要点下列哪一项是错误的

itp的治疗不宜采用下列哪一项:

40岁男性,因双下肢皮肤出血点伴口腔血疱6天入院。查体:t 37℃,r16次/ 分,p90次/分,bp130/80 mmhg ,全身皮肤粘膜无苍白、黄染,双下肢可见大小不等的出血点、紫癜,舌面及舌缘有两个6mm×5mm 大小的血疱,浅表淋巴结不大,胸骨无压痛,心肺无征,腹软,肝脾未及。血常规:wbc 4.5×109/l,中性分叶核粒细胞 60%,rbc 4.40×1012/l,hb 150g/l,plt 6×109/l。骨髓有核细胞增生活跃,巨核细胞150个。临床诊断为itp,治疗以下哪项不正确

下列哪项与慢性髓系白血病不符

男,32岁,患慢粒半年,应用马利兰治疗,近半月牙龈出血明显。查体:双下肢出血点,脾肋下7cm,红细胞无异常,hb70g/l,wbc50×109/l,plt50×109/l,骨髓增生极度活跃,原始粒细胞占15%。该病例的诊断为

再生障碍性贫血诊断标准

贫血、出血、感染、肝脾肿大是再生障碍性贫血的临床表现

再生障碍性贫血的血象特点

库欣综合征分泌过多的激素是

库欣综合征实验室检查血acth水平不升高的可能病因是

关于cushing综合征下列哪一项是错误的

指出下列哪项为cushing综合征的并发症:

大剂量抑制试验可用于鉴别

怀疑cushing综合征时,最好的激素测定是

关于正常人皮质醇节律,下列说法哪项最正确:

小剂量抑制试验可用于鉴别

不依赖acth的cushing综合征的病因是

肾上腺皮质腺瘤致cushing综合征的治疗方法是

类风湿关节炎的基本病理改变是

下列关于类风湿关节炎的说法,不正确的是

诊断类风湿关节炎常做的实验室检查有

类风湿关节炎的关节症状特点是

下列哪项不符合类风湿关节炎的临床表现

类风湿关节炎最常累及的关节部位是

下列关于类风湿关节炎的治疗说法错误的是

1987年类风湿关节炎分类标准中不包括下列哪项内容

下列关于类风湿关节炎的实验室检查,说法错误的是

下列关于类风湿关节炎的关节外表现,说确的是

数控机床的核心部件是( ),就像人的大脑。

cnc系统的plc是( )

适用于加工形状特别复杂(曲面叶轮)、精度要求较高的零件的数控机床是( )

数控机床只用于金属切削类加工。

数控本体是数控机床的机械结构实体,是用于完成各种切割加工的机械部分。

刀具在刀库中的位置是固定不变的。

本门课程分为几个模块,多少个学习任务?

关于翻转课堂,描述正确的是( )。

在线课程的理念是什么

在线课程的课程理念是以人为本、随时学习、终身学习理念

在新课程是想什么时候学习就什么时候学习,高兴的时候学习就好。

本门课程的素质目标是具备较好的自主学习能力,能独立获取新知识,并能现学现用。( )

在线课程教学资源体系的中心是微课视频( )

本门课程分为几个模块,多少个学习任务?

关于翻转课堂,描述正确的是( )。

关于在线课程,下列说确的是( )。

模块二讲授数控机床维修基础的时候,一共有几个任务,讲工具测量的是哪个任务( )。

本门课程在讲授电气故障时,以数控机床为载体,分别是( )

在线课程的课程理念是以人为本、随时学习、终身学习理念

本课程是由三个学校共同建设和使用的,并欢迎各个学校的同学在线学习。( )

本门课程的在线学习环节,主要是运用手机、电脑进行网络学习( )。

本门课程的素质目标是具备较好的自主学习能力,能独立获取新知识,并能现学现用。( )

在线课程教学资源体系的中心是微课视频( )

数控机床故障按发生部位可分为

数控机床日常维护中,下列哪些做法不正确

数控机床的故障一般有两种,由于操作、调整处理不当引起的,称为硬故障,由于外部硬件损坏引起的故障,称为软故障。

一般数控机床发生故障时,有故障信息提示,所有的故障都可以根据内容提示和查阅手册直接确认故障原因。

cnc系统发生故障时,往往是同一现象,同一报警号可以有多种起因,有的故障根源在机床上,但现象却反映在系统上。

在数控机床故障处理中,下列说确的是

利用直观法诊断cnc机床的故障时,如机床已断电,则要注意观察,以下说法中正确的是

数控机床日常维护中,下列哪些做法是正确的

为消除滚珠丝杠螺母副的轴向间隙,可采用预紧的方法,预紧力越大,效果越好。

为了保证电气柜更好散热通风,最好经常打开电气柜控制门。

浴盆曲线的故障率最低是哪个时期( )

浴盆曲线的纵坐标和横坐标分别代表()

电源相序错误造成的故障是( )的故障

在数控机床故障维修统计数据中显示,( )引起的故障最高

数控机床加工过程中,正反向进给时产生振动,有可能是( )引起的故障?

衡量数控机床可靠性的说法,( )是正确的

直观法诊断数控机床故障时,( )是错误的。

万用表不能够实现下面( )功能

示波器主要可以完成下面哪些功能( )

利用直观法诊断cnc机床的故障时,如机床已断电,则要注意观察,以下说法中正确的( )

cnc铣床伺服电机出现过热产生报警,可能的原因是( )。

cnc铣床超行程产生错误信息,不正确的解决方法为( )。

数控机床日常维护中,下列哪些做法是正确的( )

数控机床的故障一般有两种,由于操作、调整处理不当引起的,称为硬故障,由于外部硬件损坏引起的故障,称为软故障。

一般数控机床发生故障时,有故障信息提示,所有的故障都可以根据内容提示和查阅手册直接确认故障原因。

当数控机床发生故障时,应立即切断电源。

cnc系统发生故障时,往往是同一现象,同一报警号可以有多种起因,有的故障根源在机床上,但现象却反映在系统上。

为消除滚珠丝杠螺母副的轴向间隙,可采用预紧的方法,预紧力越大,效果越好。

为了保证电气柜更好散热通风,最好经常打开电气柜控制门。

为了避免电气柜惹尘,最好不要打开电气柜控制门。

数控机床的中伺服系统取代了传统机床中 传动

衡量数控机床可靠性参数中,有效度a的值越接近 越好。

数控机床可以分为 部分和电气部分

一般可以将维修工作分成修前准备、 和修后档案工作。

安装在数控机床机械十字滑台的底座上,用于水平调试的工具

使用钳形电流表时,应注意钳形电流表的( )

示波器面板上标定的垂直偏转因数v/中电压“v”是指( )

万用表可以检测( )

数字万用表在测量电阻时,档位应该按照从大到小测量

示波器扫描时间因数是指光点在x轴方向移动单位长度所需要的时间

伺服系统是指以机械( )作为控制对象的自控系统

数控机床日常维护中,下列哪些做法是正确的

数控机床由( )组成

数控机床的维护非常麻烦,应该有专业维修人员来做,操作员只需要做好自己的工作就可以了

cnc系统发生故障时,往往是同一现象,同一报警号可以有多种起因,有的故障根源在机床上,但现象却反映在系统上。

1.主轴在强力切削时停转,( )不是故障原因。

2.主轴旋转精度包括( )。

3.以下选项哪个不属于主轴不转动的主要故障原因( )。

4.主轴轴承损伤或不清洁不会引起主轴发热。

5.主轴旋转精度可采用百分表进行测量。

1.滚动导轨预紧的目的( )。

2.下列机床导轨副中,低速运动和微量进给时最容易出现爬行现象的是( )。

3.数控机床导轨按接触面的摩擦性质课分为华东导轨、滚动导轨和( )导轨三种。

4.直线滚动导轨副的安装过程中需要用到皮锤和扳手。

5.导轨副安装后,两根导轨不必平行,在整个长度范围内也不必等高。

1.螺距误差补偿和反向传动间隙补偿是对( )机构,进行误差补偿的工作。

2.以下各项中,属于滚珠丝杠螺母副的缺点是( )。

3.一端固定,一端自由的丝杠支撑方式使用于( )。

4.滚珠丝杠螺母副的轴向间隙过大,会影响进给系统的定位精度。

5.滚珠丝杠螺母副将电机的旋转运动转变成工作台的直线移动。

1.安装在气缸外侧的( )检测气缸活塞位置,即检测活塞的运动行程。

2.液压系统的工作压力取决于( )。

3.下列关于单向节流阀的说法错误的是( )。

4.电磁换向阀是由单向阀和节流阀并联而成的方向控制阀,用于控制气缸的运动方向。

5.关于气动系统的密封性检查中,轻微的漏气可以用涂抹肥皂水的办法进行检修。

1.以下选项哪个属于主轴不转动的主要故障原因的是( )。

由于缺少润滑而造成的主轴噪声故障改如何处理()。

下列不属于导轨副精度检测与调整的是( )。

数控机床上的滚珠丝杆螺母的传动效率为( )。

在检查气动元件调压阀时,定检的主要内容有( )。

主轴传动系统的滚珠丝杠螺母副可以将电机的转动转变成工作台的直线移动。

主轴上刀具松不开的原因之一可能是系统压力不足。

导轨副的维护一般包括导轨副的润滑、滚动导轨副的预紧和导轨副的防护。

滚珠丝杠副的装调过程中需要检测电机支座和轴承支座的同轴度误差。

预紧滚珠丝杆螺母副时,合适的预紧力应为最大轴向负载的1/4。

滚珠丝杠副消除轴向间隙的目的主要是减小摩擦力矩。

单向节流阀是由单向阀和节流阀并联而成的流量控制阀,用于控制气缸的运动速度。

保证供给洁净的压缩空气,保证空气中含有适量的润滑油是气压传动系统的维护要点。

液压系统中改变机械结构的动作方向是换向阀来控制的。

关于气动系统的密封性检查中,轻微的漏气应利用仪表,或用涂抹肥皂水的办法进行检修。

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