（）, 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.

When loading or discharging dry mud or cement，crew members should use goggles and（）.

Effects which are dutiable or subject to prohibitions or restrictions should be declared in （）.

按照电动机学原理，当（）的定子三相绕组接通三相交流电源时，就会产生旋转磁场。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。

交流发电机定子三相绕组星形接法—发电机（）性能好，

三相交流发电机电枢绕组接成星形时，其供电方式：（）

三相交流发电机三相绕组可以接成星形和三角形，正确的叙述是：（）

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。