简述布尔算符（OR）的作用。

基础型课程注重学生基础学力的培养，即培养学生作为一个公民所必须的“三基”为中心的基础教养。“三基”指的是（）

基础型课程注重学生基础学力的培养，即培养学生作为一个公民所必需的“三基”为中心的基础教养。“三基”指的是（）。

OR指令的作用是: 。( )

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。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。

积分作用在系统中起着（）的作用；微分作用在系统中起着（）的作用。