如图所示长度相同的三根轻杆构成一个正三角形支架固 定质量为2m的小球a质量为m的小球b支架悬挂在o点可绕过o点并与支架所在平面相垂直 Template




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tomski如图所示长度相同的三根轻杆构成一个正三角形支架固 定质量为2m的小球a质量为m的小球b支架悬挂在o点可绕过o点并与支架所在平面相垂直 coloring