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。

矿相学研究不必研究矿石的工艺性质。

矿相学研究内容包括鉴定金属矿物、研究矿石的组构特征和研究矿石的工艺性质。

矿相学研究不用考虑矿石的组构特征。

矿相学研究范围包括金属矿物学和矿石学的主要部分。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。