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。

四根说认为，万物是由（）组成的。

“四体液”致病说中的四体液是指（）

“四体液”致病说中的四体液是指（）

恩培多克勒认为万物由多少种元素组成（）

恩培多克勒认为万物由（）元素组成？

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。