单项选择题
A.转环B.末端链环C.加大链环D.链端卸扣
A.R =41d2(kN)B.R =41d2(kg)C.R =27d2(kN)D.R =27d2(kg)
A.R =13.5d2(kN)B.R =13.5d2(kg)C.R =15.3d2(kN)D.R =15.3d2(kg)
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