（）, 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 （）.

影响游客知觉的因素包括客观因素和主观因素两个方面。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。

西安邮电大学学报《西安邮电大学学报》在（）2013、2014年度连续2年入选。

以下不属于西安邮电大学省部级重点学科的是（）

以下开设的专业中为西安邮电大学国家级特色专业的是（）

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。