离心泵气蚀余量Δh与流量Q的关系为（）。

离心泵基本特性曲线中最主要的是（）曲线（其中Q、H、N、η及Δh分别表示流量、扬程、功率、效率及允许汽蚀余量）。

翻译：With Average or With Particular Average（WA or WPA）（）

在其他条件相同时，离心泵的必需汽蚀余量（），泵越容易发生汽蚀。

离心泵的临界汽蚀余量与如下各项中的几项有关？（） ①离心泵的安装高度； ②离心泵的流量； ③离心泵的结构； ④吸入管路的配置情况。

Every deliberate act of wrongdoing by the master or any of the crew against the ship or cargo，without the authorization or privity of the Shipowner or his agent，is（）.

（）, 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。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。