简述布尔算符（OR）的作用。

各种昆虫具有的共同特征是：成虫都有（）。

简述虚拟现实技术及其主要特征。

简述农业技术经济学的主要特征。

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.

蜜蜂在分类学上属于环节动物门、昆虫纲、膜翅目、蜜蜂总科、蜜蜂科蜜蜂属。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。

鳞翅目成虫羽化后，为了促进性成熟，需要进行（）。

简述农学（广义、中义、狭义）的含义。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。