简述布尔算符（OR）的作用。

OR指令的作用是: 。( )

排架结构的抗震内力组合一般只考虑重力荷载、水平地震作用、风荷载的效应组合。

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.

在结构抗震设计中，框架结构在地震作用下（　　）。

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。

利用分层法进行框架结构竖向荷载作用下的内力分析时，必须考虑框架的侧移。