（）, or drum is used for hauling in or letting out the wires or ropes which will fasten the ship to the shore.

A salvor may be（）the whole or part of the payment due under Salvage Convention to the extent that the salvage operations have become necessary or more difficult because of fault or neglect on his part or if the salvor has been guilty of fraud or other dishonest conduct.

The （） is used for hauling in or letting out the wires or ropes.

Vessels must be（）valid certificate of nationality or certificated of registry or license.

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。

修配装配法就是在成批和大量生产中，将产品各配合副的零件按实测尺寸分组，装配时按组进行互换装配以达到装配精度的方法。

起重量50t的中级工作制处于一18°C地区的露天料场的钢吊车梁,宜采用下列哪种钢?()

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。

（）为钢屋架装配的预焊接收缩量。

常用的钢屋架的承重结构有（），（），网架和（）等。

成批的钢屋架，多数采用（）进行装配。

钢屋架多采用什么方法进行装配？