11.如图2 9所示一轻质三角形框架b处悬挂一定�轮.一体重为500n的人通过跨定�轮的轻绳匀速提起一重为300n的物体. 1此时人对 Template




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tomski11.如图2 9所示一轻质三角形框架b处悬挂一定�轮.一体重为500n的人通过跨定�轮的轻绳匀速提起一重为300n的物体. 1此时人对 coloring