（）, 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 （）.

简述当代大学生的历史使命。

简述大学生的历史使命。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。

简述西藏碉楼的建筑特点。

简述西藏布达拉宫的建筑组成与艺术成就。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。