What does the term head mean when applied to a fire pump?（）<br>A:Length of the discharge pipe<br>B:Height of the discharge pipe<br>C:Difference between the discharge and suction pressures<br>D:Sum of discharge and suction pressures

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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