单项选择题

On a class B fire，which portable fire extinguisher would be the LEAST desirable?（）

A.Carbon dioxide
B.Water (stored pressure)
C.Dry chemical
D.Foam

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Oily rags stored in a pile that is open to the atmosphere are a hazard because they may（）.

A.deteriorate and give off noxious gasses
B.spontaneously heat and catch fire
C.attract lice and other vermin and serve as a breeding ground
D.None of the above

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Normally，potable water systems are connected directly to the（）.

A.fire-main system
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Line throwing apparatus aboard ship must contain（）.

A.two rockets，one of which shall be the buoyant type
B.three rockets，one of which shall be the buoyant type
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D.five rockets，two of which shall be the buoyant type