下列哪两个物体,可以认为是保持静止的:A、地球和太阳;B、一列沿

下列哪两个物体,可以认为是保持静止的:

A、地球和太阳;

B、一列沿平直轨边行驶的列车中一号车厢和5号车厢;

C、人行车时左脚和右脚;

 D、火箭发射离开地面时火箭与地面.

答案

B

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