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？

口服补液及时纠正脱水，应用ORS，说法正确的是（）

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。

多位数码管显示大多采用（）显示方式。

LED数码管若采用动态显示方式，下列说法错误的是（）

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。

电子课常用的显示器有半导体LED显示器，（）显示器。