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.

沉淀蛋白质的常用方法有：（）（）（）（）（）等。盐析法沉淀蛋白质的原理是：（），盐析法是（）的。可逆沉淀包括：（）（）（）。

可引起蛋白质不可逆沉淀的有（）

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。

不与生物碱沉淀试剂发生沉淀反应的化合物是

不与生物碱沉淀试剂发生沉淀反应的化合物是（ ）

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。