输出继电器（OR）通过一对（）触点将PLC的控制信号传递给负载。

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.

离心泵的流量调节阀安装在离心泵（）管路上，关小出口阀门后，真空表的读数（），压力表的读数（）。

离心泵启动时入口阀门应该打开。出口阀门应该（）。

逐渐关小泵出口阀时，离心泵入口真空表的读数按什么规律变化（）。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。

离心泵在出口阀门（）状态下启动。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。