常用布尔算符有：and、or、not等，当采用同义词进行检索时应当选用的算符是？

他励直流发电机，当转速升高20%时，电势（）；并励直流发电机当转速升高20%时，电势（）。

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。

金属导体当温度升高时电阻将（）。

当温度升高时，半导体的电阻将（）。

变压器负载损耗中，绕组电阻损耗与温度成正比；附加损耗与温度成（）。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。