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 （）.

零售生命周期假说认为，零售业态的生命周期的四个阶段不包括（　　）。

从企业中知识的生命周期来看，知识处理分为知识生成、知识存储、知识编码、知识转移四个阶段，不同阶段需要相应的企业知识管理的工具。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。

简述产业生命周期的四个阶段。

生命周期评价过程的四个阶段（）。

产品生命周期的四个阶段（）。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。