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Stress on the topping lift of a swinging boom can be reduced by ______.A.rigging a back stayB.raising the boomC.increasing the mechanical advantage of the cargo purchaseD.taking all slack out of the preventer
题目
Stress on the topping lift of a swinging boom can be reduced by ______.
A.rigging a back stay
B.raising the boom
C.increasing the mechanical advantage of the cargo purchase
D.taking all slack out of the preventer
相似考题
参考答案和解析
正确答案：B
回转式吊杆减小千斤索的拉力可通过升起吊臂。
回转式吊杆减小千斤索的拉力可通过升起吊臂。
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