（）, or drum is used for hauling in or letting out the wires or ropes which will fasten the ship to the shore.

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。

请根据酶生物合成的调节类型及机制提出提高酶的生物合成的策略。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。

常用的产酶微生物

产酶的主要微生物有（）、（）、（）。

可以通过哪些途径获得产酶微生物