如图所示定�轮至�块的高度为h已知细绳的拉力为f�块沿水平面由a点前进s至b点�块在初末位置时细绳与水平方�夹角分别为α和β求�块 Template




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tomski如图所示定�轮至�块的高度为h已知细绳的拉力为f�块沿水平面由a点前进s至b点�块在初末位置时细绳与水平方�夹角分别为α和β求�块 coloring