單項(xiàng)選擇題

Carbon dioxide as a fire fighting agent has which advantage over other agents?（）

A.It causes minimal damage
B.It is safer for personnel
C.It is cheaper
D.It is most effective on a per unit basis

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單項(xiàng)選擇題

Camphor oil is classified as a（）.

A.Grade A flammable liquid
B.Grade C flammable liquid
C.Grade D combustible liquid
D.Grade E combustible liquid

單項(xiàng)選擇題

By regulation，you MUST keep a record of the use of your radiotelephone for a minimum of（）.

A.six months
B.one year
C.two years
D.thirty months

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