单项选择题

The discharge side of every fire pump must be equipped with a（）.

A.gate valve
B.pressure gauge
C.check valve
D.strainer

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单项选择题

The discharge from a carbon dioxide fire extinguisher should be directed（）.

A.at the base of the flames
B.at the center of the flames
C.to the lee side of the flames
D.over the tops of the flames

单项选择题

The disadvantage of using CO2 is that the（）.

A.CO₂ does not cool the fire
B.cylinders are regulated pressure vessels
C.C0₂ is not effective on class B fires
D.C0₂ is not effective on class C fires