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 （）.

（）are liable to be stoten, pilfered or may damaged due to improper handing or stowage.

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。

油田在开采期间，油井关井待压力恢复稳定后测得的油层中部压力是（）。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。

石油的开采方式有（）。

地表附近的石油可以使用（）的方式开采。

二次采油是以（）作为石油的排驱剂的开采方式。