三相异步电动机的定子铁心中放有三相（）绕组。

三相异步电动机的定子由机座、铁心和定子绕组组成。定子铁心是电动机的磁路部分。定子绕组是电动机的电路部分，它由三相对称绕组组成，三相绕组按照一定的空间角度依次嵌放在定子槽内，并与铁心绝缘。

可以在（）阶段采用Make-or-buy决策分析。

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.

交流三相异步电动机的定子是由定子铁心、定子绕组和机壳组成。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。

交流电动机定子铁心采用硅钢片叠压而成是为了减小铁耗。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。