（）, 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

什么是地图语言？地图语言包括的三大要素：地图符号、地图色彩、地图注记。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。

试述地图比例尺的定义和作用。

地图上，面状符号所代表的概念是位于空间的面。符号的（）与地图比例尺有关。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。