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。

Demand curve（or demand schedule） 需求曲线（或需求表）

根据无差异曲线分析，消费者均衡是（）

用无差异曲线和消费可能线说明如何实现消费者均衡？

下列关于等产量曲线与消费者均衡分析中的无差异曲线的不同之处，在于（）。

根据无差异曲线分析,消费者均衡是无差异曲线与预算线的( )。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。