（）, 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 （）.

地图的数学要素包括地图的（）等内容，是地图制图的基础

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。

地图比例尺表示形式有哪些？

地图上表示各种信息是通过特殊的地图符号系统来实现的。

地图上表示各种信息是通过特殊的地图符号系统来实现的。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。