我国将于今年下半年发射“嫦娥一号”探月卫星,卫星在到达月球前

我国将于今年下半年发射“嫦娥一号”探月卫星,卫星在到达月球前,依靠火箭的反向推力使它的速度越来越慢,这是因为力可以                         。“嫦娥一号”绕月飞行时,以地球表面为参照物它是           (运动/静止)。

答案

改变物体运动状态 运动 

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