简述布尔算符（OR）的作用。

影响昆虫生活的外界环境包括生物的和非生物的，生物环境是指（）

小鼠的主要生物学特征有哪些？

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。

农业昆虫学研究的主要内容是什么？

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。

昆虫外形诸特征中，最显著的特征是（）。