简述布尔算符（OR）的作用。

ANB指令是（）指令，ORB是（）指令，与and、or指令不同。

OR指令的作用是: 。( )

我们经常在搜索时使用组合关键词来提高检索的效率，下列表达式中，具有相同搜索效果的是（）。 ①深圳夜景 ②深圳OR夜景 ③深圳-夜景 ④深圳+夜景

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。

执业药师资格考试科目包括药学（中药学）专业知识（一）、药学（中药学）专业知识（二）、（）、（）4个科目。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。