关键词法的概念。

（）组织法根据所使用的主题检索语言又分为标题法、单元词法、叙词法、关键词法和自然语言组织法。

主题组织法语言一般可分为标题法、（）、叙词法、关键词法四种类型。

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.

When loading or discharging dry mud or cement，crew members should use goggles and（）.

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。

采用叙词法标引文献（组织信息）时，可选用（）标引文献。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。