解: AB、BC杆为二力杆,取滑轮B(或点B),画受力图,建图示坐标系 (3分)<br/><img src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/examination/imgUplod/1607304688139c8b29ebaf22e4664b7c77ee750daa44aimage9.png" style="width:135px;height:102px;"><img src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/examination/imgUplod/16073046882170eb8c49c0c2e4c41b397da53c1a5290fimage10.png" style="width:89px;height:146px;"><img src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/examination/imgUplod/1607304688247567cb6c5424f4a2288b0c7fabfe8a315image11.png" style="width:170px;height:196px;"><br/><img src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/examination/imgUplod/160730507403948014ebe02ad4566b855642ac31c6bc2.png">
解: AB、BC杆为二力杆,取滑轮B(或点B),画受力图,建图示坐标系 (3分)
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