题干

用相对论的观点判断,下列说法正确的是(  )

A:时间和空间都是绝对的,在任何参考系中一个事件发生的时间和一个物体的长度总不会改变.

B:在地面上的人看来,以10 km/s的速度运动的飞船中的时钟会变慢,但是飞船中的宇航员却看到时钟是准确的

C:在地面上的人看来,以10km/s的速度运动的飞船在运动方向上会变窄,而飞船中的宇航员却感觉到地面上的人看起来比飞船中的人扁一些.

D:当物体运动的速度v≪C时,“时间膨胀”和“长度收缩”效果可忽略不计.

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答案(点此获取答案解析)

B,C,D

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