（）, 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。

使外来化学物易于经生物膜简单扩散的因素为（）

酶水平的调节至少有三种方式：（）、（）、（）。按此划分，酶生物合成的诱导和阻遏应属于（）。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。

辅阻遏物

辅（共）阻遏物