what is the difference between a link and a part?
how many frames can exist in a mechani?
what are the composition elements of mechanis?
which ones in the following are not kinematic pairs?
what are the characteristics of kinematic pairs?
which of the following descriptions is the right definition for kinematic diagrams?
the degree of freedom of a mechani is
what is the right expression to determine the degree of freedom for a mechani?
passive degree of freedom refers to
what results in multiple pin joints in a mechani?
redundant constraints refer to
what is the condition to have a determined motion for a mechani?
the composition principle of mechanis refers to
the characteristics of assur groups are
what is the right expression to determine the degree of freedom for a mechani?
lower pairs are kinematic pairs with
passive degree of freedom refers to
redundant constraints refers to
which of the following terms are the proper descriptions of the characteristics for kinematic pairs?
what are the composition elements of mechanis?
the characteristics of assur groups are
this is a lower pair connection
this is a lower pair connection
this is a lower pair connection
this is a lower pair connection
this is a lower pair connection
this is a lower pair connection
for a mechani, when its degree of freedom equals to the number of driving links, it has determined motion.
in the calculation of degree of freedom, we should not consider redundant constraints.
what is the main content of “theory of machines and mechanis”?
what should students pay attention to in the study of ‘theory of machines and mechanis’?
the study objects of the course ‘theory or machines and mechanis’ are machines and mechanis.
what are the main features of machines?
what are the main features of mechanis?
what are the main features of machines?
what are the main features of mechanis?
the study objects of ‘theory of machines and mechanis’ are mechanis and machines.
what are the methods of kinematic ysis?
characteristics of instantaneous center of velocity include
"the instantaneous center of velocity of the two links that form a higher pair must be located at the contact point of the two links." is this statement correct?
the instantaneous center of velocity of two links that form a turning pair is located at
the instantaneous center of velocity of two links that form a sliding pair is located at
the instantaneous center of velocity of two links that form a higher pair is located__
instantaneous center p13 is the point at which link () and link () share the same velocity, including the magnitude and direction
what are the methods used to conduct kinematic ysis?
characteristics of instantaneous center of velocity include
"the instantaneous center of velocity of the two links that form a higher pair must be located at the contact point of the two links." is this statement correct?
which is the correct definition of the coefficient of travel speed variation?
in order to make a mechani realize quick-return motion, what is the requirement for the value of the coefficient of travel speed variation k?
what conditions must be met for a linkage mechani to have dead points?
the basic form of the planar linkage mechanis is _____.
what is the definition of imbalance angle?
in the linkage shown in the figure, it is known that lab = 160mm, lbc = 260mm, lcd = 200mm, lad = 80mm. the link ab is taken as the driving link and it rotates at a constant speed clockwise. the coefficient of travel speed variation k equals to ___.
in the four-bar linkage shown in the figure, it is known that lab = 100mm, lbc = 300mm, lcd = 200mm, and lad = 350mm. link ab is taken as the driving link. what is the minimum tranission angle γmin of the linkage?
when a linkage mechani is in its ‘dead point’ position, the pressure angle α = ( )
given a crank-slider linkage abc, the stroke of the slider is h = 100mm, eccentricity is e = 15mm, coefficient of travel speed variation is k = 1.2. please design this crank-slider linkage and determine the crank ab length lab and coupler bc length lbc.
what are the characteristics of linkage mechanis?
“dead points” in mechanis could be practically useful or harmful.
in the four-bar linkage shown in the figure, ad is known as the frame, lbc = 50mm, lcd = 35mm, and lad = 30mm. if the mechani is a crank-rocker linkage, and ab is crank, then the maximum length labmax of ab is ____mm.
in the offset crank-slider linkage shown in the figure, it is known that a = 100mm, e = 40mm. if ab can be taken as a crank, the minimal length of link b is ___ mm.
which of the following links belong to cam mechanis?
how to keep a cam in continuous contact with the follower?
what’s the definition of the base circle for a cam mechani?
in a work cycle of a cam mechani, which of the following phases are essential?
which of the following motions will cause rigid impulses in a cam mechani?
the motion parameters of a follower include:___
which of the following motions will cause flexible impulse in a cam mechani?
which of the following motions exhibit no impulse in a cam mechani?
‘the follower motion depends on the cam profile’. is this statement correct?
which of the following is the basic method used in designing cam profiles?
what is the relationship between the theoretical profile and the actual profile of the cam?
when the base circle of a cam disk becomes larger, the pressure angle of the mechani _____.
the pressure angle of a cam mechani is___.
cam mechanis can be classified into different types according to ( ).
the cam mechanis can also be classified into different types according to ( ).
which of the following phases must be included in a work procedure of cam mechanis ( ).
what will happen if the radius of the base circle and the radius of the roller in a cam mechani are not designed properly?
what are the features of gear mechanis?
conjugate gear profile refers to
the shape of the gear involute profiles depends on the
features of involute curves include
what is the function of the reference circle?
what are the basic parameters of involute standard spur gears?
which of the basic parameters of involute standard spur gears have standard values
compared with gears, racks have characteristics of
what is the correct mating condition for involute spur gears?
what is the continuous mating condition?
what is the relationship between single tooth mating zone length (ls) and base circle pitch (pb) of an involute standard spur gear with contact ratio =1.4
what is the relationship between double teeth mating zone distance (ld) and base circle pitch (pb) of a involute standard spur gear with contact ratio =1.4
when a pair of involute spur gear is in tranission and the contact ratio equals 1, the length of actual meshing line is equal to
what is the correct mating condition for involute standard spur gears?
what is the correct installation condition for involute standard spur gears?
what is the reason for undercutting in the generating method of gear machining?
methods of machining for gears include
what are the advantages of modified gears?
increase helix angle may result in
compared with standard spur gears, helical gears have advantages of
the standard parameters of bevel gears are defined at____?
the shape of the gear involute profiles depends on the
on the involute profile, pressure angle on the ( ) circle is zero, pressure angle on the ( ) circle is the largest?
the continuous meshing condition for standard involute spur gears is
contact ratio ε of standard involute spur gears equals to______
what is the correct meshing condition for a pair of involute helical gears?
what are the basic parameters of involute standard spur gears?
what are the correct installation conditions for standard involute spur gears?
a gear with a pressure angle α=15° can mesh with a gear with pressure angle α=20°.
the classifications of gear trains include_____.
the combined gear trains are composed of_____?
what are the conditions need to be satisfied when determining the number of teeth of each gear in an epicyclic train?
what applications do the gear trains have?
the figure shows a hand-operated lifting mechani. given the number of teeth, z1 = 20, z2 = 50, z2’ = 15, z3 = 15, z3’ = 1, z4 = 40, z4’ = 18, z5 = 54. then, the gear ratio i15 is ___.
composition of ratchet mechanis includes
ratchet mechanis can be classified according to
usage of ratchet mechani includes
motion parameter k of the geneva mechani is defined as
the geneva mechani consists of
types of geneva mechani include
features of geneva mechani include
increasing the number of slots will result in
intermittent gear mechani can be classified as
the driving gear of an intermittent gear mechani must be incomplete gear
what are the composition of screw mechanis?
properties of screw mechanis are
composition of universal joint includes
the number of slots z should be greater or equal to
what is the purpose of machinery balance?
what are the disadvantages of unbalanced machinery?
types of machinery balance include
the methods to evaluate the allowable unbalance of a rotor include
the purpose of balance for mechanis is to eliminate
what need to be performed to have a fully balanced mechani?
what is the purpose to conduct balancing for mechanical systems?
what is the main purpose of kinetics ysis of mechanical systems?
what are the basic periods of machine running?
what may be the types of the driving force acting on the machine?
what may be the types of the resistance acting on the machine?
the figure shows the diagram of the equivalent driving torque med and the equivalent resistance torque mer of a machine whose moment of inertia je is constant. at which angular position, the angular velocity of the equivalent link reaches its maximal value ωmax.
the figure shows the diagram of the equivalent driving torque med and the equivalent resistance torque mer of a machine whose moment of inertia je is constant. at which angular position, the angular velocity of the equivalent link reaches its minimal value ωmin.
what causes periodic speed fluctuation in machine operation?
what are the three periods in the running of a mechanical system?
下列函数中，哪个函数具有最快的增长速度：
下面一段代码的时间复杂度是？if ( a > b ) { for ( i=0; ii; j-- ) a = b; } else { for ( i=0; ii; j-- ) a = b; }
对于线性表，在顺序存储结构和链式存储结构中查找第k个元素，其时间复杂性分别是多少？
在顺序结构表示的线性表中，删除第i个元素（数组下标为i-1)，需要把后面的所有元素都往前挪一位，相应的语句是： for (___________ ) ptrl->data[j-1]=ptrl->data[j]; 其中空缺部分的内容应该是
下列函数试图求链式存储的线性表的表长，是否正确？ int length ( list *ptrl ) { list *p = ptrl; int j = 0; while ( p ) { p ; j ; } return j; }
借助堆栈将中缀表达式a-(b-c/d)*e转换为后缀表达式，则该堆栈的大小至少为：
设1、2、…、n–1、n共n个数按顺序入栈，若第一个出栈的元素是n，则第三个出栈的元素是：
若用单向链表实现一个堆栈，当前链表状态为：1->2->3。当对该堆栈执行pop()、push(4)操作后，链表状态变成怎样？ （1）4->2->3 (2) 1->2->4
如果一堆栈的输入序列是aabbc，输出为 abcba，那么该堆栈所进行的操作序列是什么？ 设p代表入栈，o代表出栈。
在一个链表表示的队列中， f和r分别指向队列的头和尾。下列哪个操作能正确地将s结点插入到队列中：
现采用大小为10的数组实现一个循环队列。设在某一时刻，队列为空且此时front和rear值均为5。经过若干操作后，front为8，rear为2，问：此时队列中有多少个元素？
在分量1~11的数组中按从小到大顺序存放11个元素，如果用顺序查找和二分查找分别查找这11个元素，哪个位置的元素在这两种方法的查找中总次数最少？
在分量1~11的数组中按从小到大顺序存放11个元素，如果进行二分查找，查找次数最少的元素位于什么位置？
一棵度为 m的树有n个节点。若每个节点直接用m个链指向相应的儿子，则表示这个树所需要的总空间是n*(m 1) (假定每个链以及表示节点的数据域都是一个单位空间).。当采用儿子/兄弟（first child/next sibling）表示法时，所需的总空间是：
如果一个完全二叉树最底下一层为第六层（根为第一层）且该层共有8个叶结点，那么该完全二叉树共有多少个结点？
若有一二叉树的总结点数为98，只有一个儿子的结点数为48，则该树的叶结点数是多少？
设深度为d（只有一个根结点时，d为1）的二叉树只有度为0和2的结点，则此类二叉树的结点数至少为2d-1
假定只有四个结点a、b、c、d的二叉树，其前序遍历序列为abcd，则下面哪个序列是不可能的中序遍历序列？
对于二叉树，如果其中序遍历结果与前序遍历结果一样，那么可以断定该二叉树________
已知一二叉树的后序和中序遍历的结果分别是fdebgca 和fdbeacg,那么该二叉树的前序遍历结果是什么？
已知一棵由1、2、3、4、5、6、7共7个结点组成的二叉搜索树（查找树），其结构如图所示，问：根结点是什么？
在上题的搜索树中删除结点1，那么删除后该搜索树的后序遍历结果是：
若一搜索树（查找树）是一个有n个结点的完全二叉树，则该树的最大值一定在叶结点上
若一搜索树（查找树）是一个有n个结点的完全二叉树，则该树的最小值一定在叶结点上
将1、2、3、4、5、6顺序插入初始为空的avl树中，当完成这6个元素的插入后，该avl树共有多少层？
若一avl树的结点数是21，则该树的高度至多是多少？注：只有一个根节点的树高度为0
下列序列中哪个是最小堆？
在最大堆 {97,76,65,50,49,13,27}中插入83后，该最大堆为：
对由同样的n个整数构成的二叉搜索树（查找树）和最小堆，下面哪个说法是不正确的:
如果哈夫曼树有67个结点，则可知叶结点总数为：
为五个使用频率不同的字符设计哈夫曼编码，下列方案中哪个不可能是哈夫曼编码？
一段文本中包含对象{a,b,c,d,e}，其出现次数相应为{3,2,4,2,1}，则经过哈夫曼编码后，该文本所占总位数为：
有个顶点的无向完全图有多少条边？
给定有向图的邻接矩阵如下： 顶点2（编号从0开始）的出度和入度分别是：
有向图的邻接矩阵一定是不对称的
用一维数组g[ ]存储有4个顶点的无向图如下： g[ ] = { 0, 1, 0, 1, 1, 0, 0, 0, 1, 0 } 则顶点2和顶点0之间是有边的。
用邻接表表示有个顶点、条边的图，则遍历图中所有边的时间复杂度为：
已知一个图如下图所示，从顶点a出发按深度优先搜索法进行遍历，则可能得到的一种顶点序列为
已知一个图如下图所示，从顶点a出发按广度优先搜索法进行遍历，则可能得到的一种顶点序列为
具有个顶点的无向图至多有多少个连通分量
如果从无向图的任一顶点出发进行一次深度优先搜索可访问所有顶点，则该图一定是
具有个顶点的无向图至少有多少个连通分量
给定下图，其最小生成树的总权重是
连通图的最小生成树一定是唯一的
拓扑序一定是唯一的。
下图给定了一个项目的aoe。整个项目最早完工需要的时间是
在上图中，如果<0,2>组能加快进度，整个项目就能提前完工。
对于7个数进行冒泡排序，最坏情况下需要进行的比较次数为
对一组包含10个元素的非递减有序序列，采用插入排序排成非递增序列，其可能的比较次数和移动次数分别是
希尔排序是稳定的。
对n个记录进行堆排序，最坏的情况下时间复杂度是
有一组记录（46,77,55,38,41,85），用堆排序建立的初始堆为
堆排序是稳定的。
快速排序是稳定的算法。
给定a[]={46, 23, 8, 99, 31, 12, 85}，调用非递归的归并排序加表排序执行第1趟后，表元素的结果是：
给定a[]={23, 46, 8, 99, 31, 12, 85}，调用表排序后，表元素的结果是：
基数排序是稳定的算法。
请选择下面四种排序算法中最快又是稳定的排序算法：
下列排序算法中，哪种算法可能出现：在最后一趟开始之前，所有的元素都不在其最终的位置上
当待排序列已经基本有序时，下面哪个排序算法效率最差
数据序列（3,2,4,9,8,11,6,20）只能是下列哪种排序算法的两趟排序结果
设有一组记录的关键字为 {19，14，23，1，68，20，84，27，55，11，10，79}，用分离链接法构造散列表，散列函数为h(key)= key mod 13。问：散列地址为1的链中有几个记录？
设一个散列表的大小是11, 散列函数是h(key)=key mod 11. 若采用平方探测（)冲突解决方法，将4个元素{14，38，61，86}顺序插入散列表中。如果再插入元素49，则该元素将被放在什么位置？
假设一散列表的大小是11,散列函数是h(key)=key mod 11，用线性探测法解决冲突。先将4个元素{14，38，61，86}按顺序插入初始为空的散列表中。如果再插入元素49，则该元素入到表中哪个位置（下标）？
一个大小为11的散列表，散列函数为h(key)=key mod 11，采用线性探测冲突解决策略。如果现有散列表中仅有的5个元素均位于下标为奇数的位置，问：该散列表的平均不成功查找次数是多少？
在一个大小为k的空散列表中，按照线性探测冲突解决策略连续插入散列值相同的n个元素（n
当采用线性探测冲突解决策略时，非空且有空闲空间的散列表中无论有多少元素，不成功情况下的期望查找次数总是大于成功情况下的期望查找次数。
篮球运动于 年发明。
1936年第 届奥运会，男子篮球运动被列为奥运会正式比赛项目。
年，第21届奥运会女子篮球运动被正式列为比赛项目。
1932年，在瑞士的日内瓦，由葡萄牙、罗马尼亚、瑞士、意大利、希腊、拉脱维亚、捷克斯洛伐克、阿根廷八个组织会议，成立了 。
1895年，篮球运动由人来会里博士首先传入我国 。
世界男子篮球锦标赛于1950年开始举办，四年一届，2012年1月国际篮联宣布男篮世锦赛更名为 。
六次获得nba总冠军，十次获得nba“得分王”称号，绰号“飞人”的篮球运动员是 。
男子篮球职业联赛，简称 。
大学生篮球联赛，简称cuba，是大学生体育协会主办的高校间篮球联赛，第一届cuba于 年举办。
篮球协会现任（2019年）是 。
现代篮球运动的特点反应在 、对抗性、 、综合性和职业化。
篮球运动进攻基本技术包括（ ）。
标准篮球场地尺寸为 。
一个队员被登记 次违反体育道德的犯规时，该队员应该被取消比赛资格。
国际篮球比赛由四节组成，每节 分钟，每一决胜期为 分钟。
篮球比赛中，记录员对于队员的技术犯规应登入 来表示。
国际篮球比赛中，上半场比赛某队拥有 次暂停机会。
下面 情况，某队请求“替换”，“替换”不被允许。
宣判带球跑违例的关键是 。
篮球比赛中，进攻方抢到前场篮板，24秒计时员应将进攻时间复位 秒。
篮球比赛中，某队在其后场控制球后，必须在 秒内使球进入本队的前场，否则发生违例。
国际篮球比赛，某名队员个人累积 次一般侵人犯规后，则被取消本场比赛资格。
以下属于罚球违例的是 。
以下属于违例性质的是 。
发球的执行不包括下面哪种情况
以下哪种情况不为发球后的犯规
自由防守队员可以
排球比赛正常的比赛间断（ ）
某一队员受伤或生病不能继续比赛时，首先必须（ ）
下列情况，哪条不属于“不符合规定的请求”？
当场上队员的位置与位置表不符时，下面那个选择是错的
发生轮转错误时，以下哪一条处理是错误的
下列情况不能判为界外球
第一次击球有以下哪种情况除外
以下哪些情况不属于“击球时的犯规”
以下哪条不属于球通过球网时 “过网区” 的范围
以下哪一条不属于队员干扰比赛的情况
以下哪种情况不是“发球的执行”
以下哪些情况不属于进攻性击球犯规
以下那种行为不属于拦网的犯规
按照剖切面不同程度地剖开机件的情况，剖视图可分为全剖视图、半剖视图和局部剖视图三种。
视图主要表达机件的：
剖切平面主要选择：
关于半剖视图，下列叙述正确的是：
按剖切方法的不同，剖视图可分为：
半剖视图中，半个剖视图已表达清楚的内部结构在半个视图中不画虚线。
按照剖切面剖开机件的情况，剖视图可分为 、 、 。
根据两视图，在指定位置画出全剖视的主视图、半剖视的左视图。
下列选项属于螺纹要素的是：
下列说确的是：
滚动轴承的组成包括：
弹簧的作用主要是：
齿轮的画法是：
下列说确的是：
绘制不通内螺纹孔时，钻孔底部的锥孔为90°。
螺纹的牙型种类有普通螺纹、 、 、 等。
补画螺栓连接的主、左视图。（绘制答案上传）
装配图作为技术文件主要用于：
零件图的内容包括：
运动强度越大越好
体力劳动可以代替体育锻炼
无氧运动致=指肌肉在无氧供能代谢状态下进行的运动
“rice”原则包括休息，冰敷，加压包扎，抬高伤处
功能障碍人士不应参加体育锻炼
等重的食物提供相同的能量
少吃多动就可以减重
基础代谢每个人都相同
人bmi指数18.5-24.0为体重正常
在人体内，脂肪必须被分解成甘油和脂肪酸，才有被氧化的可能
肥胖可显著增加肿瘤发病率
蛋白质不参与供能，当运动超过30分钟后，体内的糖原储备和分解不足以维持运动所需能量时，蛋白质可参与供能
肌内效贴扎技术在临床运用中以功能恢复为基本目标。
一个基本的运动处方包括运动项目，运动强度，运动时间，运动频度4个方面。
有氧运动时常用靶心率表示运动强度。
膝骨关节炎发生后应该完全制动。
前交叉韧带重建术后康复后期的目标是：全面恢复日常生活各项活动，强化肌力及稳定性。逐步恢复运动。
踝关节急性损伤后冰敷的原则是：24小时内，每隔1-2小时，冰敷15-20分钟。可隔一层毛巾以防冻伤。
膝关节的生理性弹响对人体是无害的，是不用治疗的。
后交叉韧带可以预防小腿相对于大腿向后移位，维持膝关节的稳定性
要预防膝关节内侧副韧带损伤，要避免小腿外翻，即往外撇的运动。
髌骨和髌韧带在伸膝装置中起到杠杆作用
根据跟腱断裂的程度，可分为完全断裂和部分断裂
跟腱断裂手术后，踝关节应固定在轻度跖屈位3-4周
肩周炎的好发人群为50岁左右女性
股骨头缺血坏死最常见的病因包括
创伤性股骨头坏死是由于
在成人群体里面，下列谁最接近理想的健康水平
运动对健康的影响，主要集中在
体能训练3种核心能力是
下列不属于人体能量来源的是
下列不属于单糖的是
必须氨基酸有（）种
人bmi正常范围为
下列不属于脂肪在人体内消耗的3个步骤的是
血糖生成指数低于（）的食物为低血糖生成指数食物
下列食物生物价最高的是
下列蛋白能快速被人体吸收的是
小明想要通过健身来增肌，他训练前应该避免进食的食物有
运动处方不包括以下哪一选项
膝关节骨关节炎的治疗目的不包括
下列最适合腰椎间盘突出症的患者的运动是
下列职业最易患网球肘的是
下列情况会导致爪形手的是
小腿上段“后沉征”见于
体育运动是提高与促进社会适应能力最有效的方法之一
球类运动需要良好的身体素质作为基础
空腹运动无碍健康
体力劳动能代替体育锻炼
一般来说，女性的基础代谢高于男性
通过合理的搭配，可以将“垃圾食品”变为健康食品
对于目标增肌的健身者来说，蛋白质摄入越多越好
运动会消耗微量元素
膝关节骨关节炎发生后应完全制动
膝关节周围的韧带包括前后交叉韧带，内侧三角韧带，外侧副韧带。
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