Every deliberate act of wrongdoing by the master or any of the crew against the ship or cargo，without the authorization or privity of the Shipowner or his agent，is（）.

（）, 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.

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。

食品污染根据污染物的性质可分为（）。

根据污染食品有害因素的性质，食品污染分为（）。

生物性污染包括（）以及昆虫对食品造成的污染。

食品污染是指食品被外来的、有害人体健康的物质所污染。按照污染物的性质，可分为（）污染三类。

所谓食品污染，是指食品受到有害物质的侵袭，致使食品质量安全性、营养性或感官性状发生改变的过程。根据污染的性质，食品污染可分为（）、（）和（）。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。