题目：
单杆作业受力分析：轻型单吊杆操作时，其整个装置中各构件所受之力都作用在吊杆和千斤索所组成的垂直平面内，为简化起见，可假定这些力分别汇交于（）。
A.吊杆头部
B.吊杆根部
C.千斤索眼板
D.吊杆头，吊杆根部，千斤索眼板三处
答案：
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单杆作业受力分析：轻型单吊杆操作时，其整个装置中各构件所受之力都作用在吊杆和千斤索所
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CHINA NATl0NAL ELECTRONICS
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