氨制冷系统中所有阀门安装应符合制冷系统中氨的流向。

制冷系统加氨必须在制冷系统（）试验合格、（）合格、（）合格后方可进行。

氨制冷系统中，与制冷剂接触的密封垫片必须使用高纯度的（）。

氨制冷系统中的制冷剂管道可以用铜管。

大、中型制冷系统补充制冷剂的通常做法为：氨系统关机加液；氟里昂系统开机加液。

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。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。