实验室内乙炔气着火，只可选用哪种灭火（）。

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.

乙炔气不溶于水。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。

化工工艺计算包括：（）、（）以及各种设备的工艺计算。

燃气中的嗅味是（）

乙炔气含有嗅味是有（）

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。