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 （）.

发动机磨合的主要目的是（）。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。

发动机磨合目的是什么?

何谓发动机磨合？其目的是什么？

样才能获得发动机磨合的最佳效

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。

发动机磨合规范选择的主要原则是（）。