單項選擇題Which of the following pumps belongs to centrifugal pump?（）
A.Piston pump
B.Screw pump
C.Diffuser pump
D.Water-ring pump
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1.單項選擇題The pump discharge pressure will be considerably higher than the pressure at the （）.
A.pump entry branch
B.outlet pipe
C.impeller
D.None of the above is true
2.單項選擇題What is the purpose of a relief valve?（）
A.to fill 2 tanks at the same time
B.to use pump at a higher pressure
C.to return liquid to suction side if discharge valve is closed
D.All of the above are true
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