（）, 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 （）.

（）are liable to be stoten, pilfered or may damaged due to improper handing or stowage.

集气效率在净化中要求达到（），净化效率按要求达到（）％。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。

集气管网是由若干条集气（）和集气干线组合的集气单元。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。

设备内的六氟化硫气体不得向大气排放，应采取净化装置回收，回收时作业人员应站在下风侧。