（）, 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。

（）应当落实农田水利工程运行维护经费，保障运行维护工作正常进行。

渠道水利用系数是渠道（）的比值。

渠道水的利用系数？

什么叫渠道水的利用系数？（）

渠道防渗对提高渠道水利用系数没有太大的作用。

渠系水利用系数等于各级渠道水利用系数之和。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。