数据库管理系统常用的数据模型有3种，其中(61)不是数据库管理系统的数据模型。

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（）.

Effects which are dutiable or subject to prohibitions or restrictions should be declared in （）.

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。

对于二手资料，在数据输入之前没有必要进行相关的数据收集、整理，可直接进行数据输入。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。

任何一个数据库管理系统都基于某种数据模型的，关系数据库管理系统所支持的数据模型是（）