从模型的形式来分，模型可以分为三大类：物理模型、数学模型和文字模型。

根据抽象模型形式分类，模型可以分为数学模型、逻辑模型、（）以及仿真模型等

可以在（）阶段采用Make-or-buy决策分析。

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。

按是否采用数学模型作为工具，工程咨询方法可以分为（）。

在专家系统中，求解模型有行为模型和数学模型。数学模型利用（）来完成，行为模型利用来完成。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。