Dynamics is a branch which deals with the study of the forces ___ on ___ objects.
A.acted,moving B.acting,moving,应该是选B,可是为什么呢,因为act是力本身做出的动作么?我现在是这么理解的.
人气：283 ℃ 时间：2020-05-11 07:11:47
解答
作用于移动中物体的力.主动.
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