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。

比较选择育种中两种基本的选择方法单株选择法与混合选择法优缺点。

选择育种最常见的两种选择法是单株选择法和（）。

关于选择育种法，不正确的说法是（）。

选择育种方法中，群体选择的选择效应（Rc）在理论上等于所采用的各种选择方法效应的总和。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。

按用途及植物学系统对作物进行分类中，经济作物又叫（）作物。