如图3所示球从a位置踢出去到达最高点b最后落地的过程中它的重力势能 A.一直增大 b.一直减小 C.先增大后减小 D.先减小后 Template




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tomski如图3所示球从a位置踢出去到达最高点b最后落地的过程中它的重力势能 a.一直增大 b.一直减小 coloring