简述布尔算符（OR）的作用。

建设工程项目施工图预算对施工单位的作用有(  )。

根据我国的设计、概预算文件编制和管理方法并结合建设工程概预算编制的顺序，建设工程概预算的分为投资估算、设计概算、（）、施工图预算、施工预算、工程结算、竣工决算，施工图预算是在（）阶段，设计咨询或施工单位根据施工图纸等预先计算和确定单项工程和单位工程全部建设费用的经济文件

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.

施工预算费用计算与施工图预算不同，施工图预算要计算建筑安装工程造价所有费用，而施工预算的费用不包括（）。

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。