数控系统是由硬件控制系统和软件控制系统组成，下列属于硬件控制系统的是（）。

数控系统是由硬件控制系统和软件控制系统组成，下列属于软件控制系统的是（）。

系统开环传递函数有3个极点，2个零点，则（   ）。

输出继电器（OR）通过一对（）触点将PLC的控制信号传递给负载。

根轨迹是根据系统开环零极点分布而绘制出的闭环极点运动轨迹。

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。