如图所示物体甲和乙所受重力都为50牛不考��轮重力.当用力分别匀速提起物体甲和乙时力fa大小为25牛力fb大小为50牛. 题目和参考 Template




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tomski如图所示物体甲和乙所受重力都为50牛不考��轮重力.当用力分别匀速提起物体甲和乙时力fa大小为25牛力fb大小为50牛. 题目和参考 coloring