（）, 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 （）.

写作摘要的注意事项（）。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。

科技论文的摘要有哪些写作要求？如何写好科技学位论文的摘要？

科技论文摘要的写作要求（）。

科技论文摘要的写作要求（）。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。