常用的步电动机有三相（）异步电动机和三相绕线式异步电动机两种。

绕线式三相感应电动机，转子串电阻起动时（）。

三相感应电动机的转子绕组分（）和绕线式两种。

三相绕线式异步电动机的定子绕组与转子绕组的极对数（）。

绕线式电动机的降压启动与笼型异步电动机的降压起动的主要区别在于绕线式电动机的降压启动是采用（）。

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.

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。

为了减少启动电流和保证启动转矩，绕线式感应电动机的启动方法采用()。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。