起重机电器连锁保护装置有哪些？
并购过程中发生的交易成本属于（） ["并购直接成本","并购间接成本","并购整合成本","并购机会成本"]
In towing，chocks are used to（）. ["protect the towline from chafing","secure the end of the towline on the tug","stop off the towline while retrieving it","absorb shock loading on the towline"]
什么是挖基础土方？
In the case of new crude oil tankers，the additional ballast permitted shall be carried in cargo tanks only if such tanks have been（）before departure from an oil unloading port or terminal. ["inerted","crude oil washed","diluted","cleaned"]
吊钩破坏的主要原因时是什么？什么情况下吊钩应报废？
