● 面向对象分析与设计技术中，（18）是类的一个实例。（18）

面向对象数据模型中，类是对一组对象的抽象描述。

面向对象程序设计中，类是指（）。

在面向对象技术中，类是关于一组对象的共同特性的抽象，其泛化关系是指(34)，聚合关系是指(35)，(36)是对象的特性的表现。

●在面向对象技术中，类是关于一组对象的共同特性的抽象，其泛化关系是指 (34) ，聚合关系是指 (35) ， (36) 是对象的特性的表现。

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。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。