（）, 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 （）.

下列账户中，（）是属核准类账户。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。

试比较水螅水母和真水母的异同点。

教育部日前印发《普通高等学校师范类专业认证实施办法（暂行）》，发布国家认证标准，（）开展师范类专业认证。

1699年巴黎科学院的学科分类中，不属于数学类的是（）

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。