15.如图所示重为8n的球b静止在与水平面成37°角的光�斜面上并通过定�轮与重4n的物体a相连.光�挡板与水平面垂直绳倾斜部分与斜面 Template




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tomski15.如图所示重为8n的球b静止在与水平面成37°角的光�斜面上并通过定�轮与重4n的物体a相连.光�挡板与水平面垂直绳倾斜部分与斜面 coloring