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【简答题】
在图示的平面系统中,球A重为P,借本身重量和摩擦不计的理想滑轮C 和柔绳维持在仰角是α的光滑斜面上,绳的一端挂着重为Q 的物体B。试分析物体B、球A 和滑轮C 的受力情况,并分别画出各物体的受力图。
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