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【多选题】
( 多选 ) 单摆是为研究振动而抽象出的理想化模型,其理想化条件是 ( ) A .摆线质量不计 B .摆线不可伸缩 C .摆球的直径比摆线长度小得多 D .只要是单摆的运动就一定是简谐运动
A.
1
B.
2
C.
3
D.
4
参考答案：
参考解析：
刷刷题刷刷变学霸
举一反三
【单选题】Z2-01-08质量为20 g的子弹,以400 m/s的速度沿图示方向射入一原来静止的质量为980 g的摆球中,摆线长度不可伸缩。子弹射入后与摆球一起运动的速度为
A.
4 m/s
B.
8 m/s
C.
2 m/s
D.
7 m/s．
【单选题】Some pessimistic experts feel that the automobile is bound to fall into disuse. They see a day in the not-mo-distant future when all autos will be abandoned and allowed to rust. Other authorities, how...
A.
keep in the right lane
B.
wait to arrive at his destination
C.
keep in constant touch with the computer center
D.
inform the system of his destination by phone
【单选题】Some pessimistic experts feel that the automobile is bound to fall into disuse. They see a day in the not-too-distant future when all autos will be abandoned and allowed to rust. Other authorities, ho...
A.
How to render automobiles pollution-free.
B.
How to make smaller and safer automobiles.
C.
How to solve the problem of traffic jams.
D.
How to develop an automated subway system.
相关题目：
【多选题】可伸缩带式输送机按照全长可划分为（）。
A.
机头部
B.
输送机的传动装臵
C.
储带仓
D.
机身部
E.
机尾部
【判断题】前移式叉车具有可伸缩的门架或货叉架。
A.
正确
B.
错误
【单选题】Z2-01-08质量为20 g的子弹,以400 m/s的速度沿图示方向射入一原来静止的质量为980 g的摆球中,摆线长度不可伸缩。子弹射入后与摆球一起运动的速度为
A.
4 m/s
B.
8 m/s
C.
2 m/s
D.
7 m/s．
【判断题】转向柱做成可断开的或可伸缩的，主要是为了减小在事故中对驾驶员的危害。
A.
正确
B.
错误
【判断题】转向柱做成可断开的或可伸缩的，主要是为了减小在事故中对驾驶员的危害。
A.
正确
B.
错误
【判断题】云计算是可伸缩的，网格计算不是可伸缩的。
A.
正确
B.
错误
【判断题】VL型球笼式万向节为可伸缩式万向节。
A.
正确
B.
错误
【单选题】Some pessimistic experts feel that the automobile is bound to fall into disuse. They see a day in the not-mo-distant future when all autos will be abandoned and allowed to rust. Other authorities, how...
A.
keep in the right lane
B.
wait to arrive at his destination
C.
keep in constant touch with the computer center
D.
inform the system of his destination by phone
【单选题】Some pessimistic experts feel that the automobile is bound to fall into disuse. They see a day in the not-too-distant future when all autos will be abandoned and allowed to rust. Other authorities, ho...
A.
How to render automobiles pollution-free.
B.
How to make smaller and safer automobiles.
C.
How to solve the problem of traffic jams.
D.
How to develop an automated subway system.
【多选题】可伸缩性包括()
A.
功能的伸缩
B.
容量的扩展
C.
性能的扩展
D.
系统的伸缩
【单选题】集装箱正面吊运机有可伸缩和左右回转（ ）的吊具，因此特别适应在货场作业。
A.
120°
B.
180°
C.
160°
D.
90°
【多选题】做简谐运动的质点在通过平衡位置时，下列物理量中具有最大值的物理量是（ ）
A.
动能
B.
加速度
C.
速度
D.
位移
【单选题】以下哪项不属于可伸缩式包装的特点?
A.
便于观赏
B.
便于运输
C.
便于取用
D.
便于整合
【判断题】可伸缩式包装,可以在运输途中减少了空间损耗,进而减少了运输成本。
A.
正确
B.
错误