小明和小华玩跷跷板当小明坐在离支点2m处时刚好能撬动小华此时跷跷板在水平位置平衡.设小明体重为g1小华体重为g2g1<g2则小华 Template




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tomski小明和小华玩跷跷板当小明坐在离支点2m处时刚好能撬动小华此时跷跷板在水平位置平衡.设小明体重为g1小华体重为g2g1<g2则小华 coloring