一般要求异步电动机三相电流中任何一相与三相电流的平均值的偏差不允许（）。

三相异步电机当转子不动时,转子绕组电流的频率与定子电流的频率相同。( )

电源屏输入的三相电压的不平衡度为（）

-48V直流电源电压变动范围（），-48V直流电源供电回路全程最大压降为（），三相交流供电，电压不平衡度不大于（）。

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。

供配电系统高、低压供配电应符合现行国家、行业标准和规范，三相供电电压不平衡度不大于（）。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。