如图a所示质量分布均匀长宽分别为ab的长方体木块abcd左上角用光�的铰链与固定装置连接底部放一个厚度与长方体宽度相同的小物块小物 Template




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tomski如图a所示质量分布均匀长宽分别为ab的长方体木块abcd左上角用光�的铰链与固定装置连接底部放一个厚度与长方体宽度相同的小物块小物 coloring