单项选择题

What does the term head mean when applied to a fire pump?（）

A.Length of the discharge pipe
B.Height of the discharge pipe
C.Difference between the discharge and suction pressures
D.Sum of discharge and suction pressures

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单项选择题

What does blowing tubes accomplish?（）

A.Eliminates unburned fuel oil residues from the firebox
B.Increases boiler efficiency
C.Flushes away mineral deposits inside the water tubes
D.Cleans soot deposits from the inside of the stack

单项选择题

What are the most important reasons for using water fog to fight fires?（）

A.Smothers burning surfaces，organically destroys fuel
B.Cools fire and adjacent surfaces，provides protective barrier
C.Reaches areas not protected by steam or CO₂ smothering systems
D.Allows fire to be attacked from leeward，saturates liquid surfaces