如图所示固定在水平面上的光�半球球心o的正 上方固定一个小定�轮c细绳一端拴一小球小球置于半球 面上的a点另一端绕过定�轮拴另一个 Template




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tomski如图所示固定在水平面上的光�半球球心o的正 上方固定一个小定�轮c细绳一端拴一小球小球置于半球 面上的a点另一端绕过定�轮拴另一个 coloring