如图所示放置在水平地面上的直角劈质量为m上面放一个质量m的物体若m在其上匀速下�m仍保持静止下列正确的说法是 A.m对地面的压力 Template




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tomski如图所示放置在水平地面上的直角劈质量为m上面放一个质量m的物体若m在其上匀速下�m仍保持静止下列正确的说法是 a.m对地面的压力 coloring