考试
2022-12-27 02:56:20

Stress on the topping lift of 

题目描述

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

A、back stay

B、raising the boom

C、increasing the mechanical advantage of the cargo purchase

D、taking all slack out of the preventer

E、KEY: B   回转式吊杆减小千斤索的拉力可通过升起吊臂。

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答案解析

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  KEY: B     回转式吊杆减小千斤索的拉力可通过升起吊臂。无

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  KEY: B     回转式吊杆减小千斤索的拉力可通过升起吊臂。

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