（）, 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 （）.

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。

参加中级鉴定的人员必须是取得初级技能证书并连续工作（）年以上、或是经劳动行政部门审定的以中级技能为培养目标的技工学校以及其他学校毕业生。

铸铁中石墨呈球状存在，它是铁水在浇注前经球化处理后获得的，称为（）铸铁。

单件或小批生产的灰铸铁件直径小于（）mm的孔通常不必铸出。

球墨铸铁是通过浇铸前向铁水中加入一定量的（）进行球化处理，并加入少量的（）促使石墨化，在浇铸后直接获得球状石墨结晶的铸铁。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。