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 （）.

什么叫化学反应速率？浓度、压强和温度对化学平衡和化学反应速率的影响？

什么叫化学反应？化学反应有哪些主要类型？

化学反应以及化学反应的基本特征。

在化学反应过程中，吸热反应要经常不断的取走热量以保持反应温度，放热反应要不断的供给热量以达到反应温度。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。

摩擦是一门新兴学科，它涉及数学、力学、物理、化学、冶金学、石油学、化学工程等学科。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。