如图所示长度相同的三根轻杆构成一个正三角形支架在a处固定质量为2m的小球 b处固定质量为m的小球支架悬挂在o点可绕过o点并与支架所在 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在a处固定质量为2m的小球 b处固定质量为m的小球支架悬挂在o点可绕过o点并与支架所在 coloring