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。

第三人称

调查报告一般使用第三人称写作。

调查报告普遍采用第三人称写作。

下列诗歌中，交替使用了第三人称和第一人称手法的是( )

总结一般用第三人称写作。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。