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.

Banks have no liability for any delay or loss caused by postal or telex failure.

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。

轮虫通常依据哪些特征进行分类？

黏孢子虫的共同特征是具有（）

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。

在人工苗种生产过程中，真鲷仔鱼开口后摄食轮虫，之后一段时间后，摄食卤虫无节幼体，在真鲷仔鱼的培育过程，真鲷仔鱼开口后一段时间是投喂轮虫的，之后是投喂卤虫的。由于卤虫成本太高，目前生产上往往延迟投喂卤虫的时间。那到底在什么时候开始投喂卤虫既能降低生产成本又不影响仔鱼摄食呢？请设计一个实验来确定开始投喂的时间？