单选题The static suction head of is the （）Adistance of the suction liquid level above the line of the pumpBdistance the suction liquid level is below the center line of the pumpCforce necessary to overcome frictional losses in the pump and pipingDamount in inches of mercury the total suction head is below atmospheric pressure
单选题
The static suction head of is the （）
A
distance of the suction liquid level above the line of the pump
B
distance the suction liquid level is below the center line of the pump
C
force necessary to overcome frictional losses in the pump and piping
D
amount in inches of mercury the total suction head is below atmospheric pressure
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