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【多选题】
倒车灯不亮可能是以下原因造成的A.
倒车灯保险烧坏
B.
倒车灯开关已坏
C.
倒车灯灯泡已坏
D.
倒车灯灯座接触良好
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反馈参考答案：
举一反三
【单选题】Consider an object on a rotating disk a distance r from its center, held in place on the disk by static friction. Which of the following statements is NOT true concerning this object?
A.
If the angular speed is constant, the object has a zero acceleration.
B.
The object has a tangential acceleration only if the disk has an angular acceleration.
C.
The object always has a centripetal acceleration except when the angular speed is zero.
D.
If the angular speed is constant, the speed of object is also constant.
【单选题】Phillip, can you see something red _____ in the distance on the water?
A.
Floated
B.
float
C.
being float
D.
floating
【简答题】凸轮机构的应用场合是什么？凸轮机构的组成是什么？
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