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。

什么是“萨伊定律”？

萨伊定律的核心思想是（）。

什么是萨伊定律？其影响有哪些？

“萨伊定律”的内容要点是什么？

萨伊定律的基本内容是（）。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。