（）, 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.

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。

干沉降多层滤膜法的采样头是由（）个安有滤膜的滤膜夹组成。

干沉降多层滤膜法的采样是由（）个安有滤膜的滤膜夹组成。

双滤膜法的采样方式为（）

双滤膜法为主动式采样。

双滤膜法能测量采样期间内氡的（）浓度。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。

室内空气采样时要对现场情况、采样日期、时间、地点、数量、布点方式、大气压力、气温、相对湿度和空气流速进行记录，并由采样者签字。