（）, 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。

橡胶硫化的历程可分为四个阶段：焦烧阶段、热硫化阶段、（）、过硫化阶段。

硫化时间对胶料定伸强度的影响过程看，可以将整个硫化过程分为四个阶段：（）、预硫阶段、正硫阶段及过硫阶段

电子商务的发展历程可分为四个阶段，第一个阶段是（）。

橡胶经过（）工艺可制成各种橡胶制品。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。