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。

深源地震多发生在（）。

浅源地震都发生在（）内。我国大部分地震是（）地震。

浅源地震深度（），中源地震深度（），深源地震深度（）。

浅源地震的深度为（），中源地震的深度为（），深源地震的深度为（）。

什么是震源深度？何为浅源地震、深源地震、中源地震？

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。