二阶系统的开环极点分别为Sl=-0.5，S2=-4，系统开环增益为5，则其开环传递函数为（　　）。

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.

试论述开环伺服控制系统、闭环伺服控制系统及半闭环伺服控制系统的工作原理及结构特点。

一个系统开环增益越大，则（）

增大系统的开环增益，会使得系统的控制精度降低。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。

最小相位系统的开环增益越大，其（）

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。