Stress on the topping lift of a swinging boom can be reduced by（）. -题库考试答案搜索网

Stress on the topping lift of a swinging boom can be reduced by（）.

单选题

2022-03-02 08:37

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

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正确答案

B

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