在经典控制理论中，可采用（）、根轨迹法或奈奎斯特判据等方法判断线性控制系统稳定性

如果系统的有限开环零点数m少于其开环极点数n，则当根轨迹增益趋近于无穷大时，趋向无穷远处根轨迹的渐近线共有（）条。

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

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。

绘制根轨迹时，我们通常是从Kg＝0时的闭环极点画起，即开环极点是闭环根轨迹曲线的起点。起点数n就是根轨迹曲线的条数。

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.

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。

根轨迹是根据系统开环传递函数中的某个参数为参变量而画出的开环极点的根轨迹图。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。