如图所示在水平粗糙地面上放置斜面体bb上再放一表面水平的三角形�块aa恰好能在b上匀速下�而b仍然静止在地面上若ab质量分别为m和 Template




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tomski如图所示在水平粗糙地面上放置斜面体bb上再放一表面水平的三角形�块aa恰好能在b上匀速下�而b仍然静止在地面上若ab质量分别为m和 coloring