你可能感興趣的試題

The advantage of a centrifugal pump as compared with a reciprocating pump is that （）.

A.discharge is continuous
B.it has no internal valves
C.upon accidental closing of discharge valve, excessive pressure will not build up
D.all of the above are true

單項選擇題

A pump is said to have "negative suction head" when the pump is located （）.

A.between the suction and discharge
B.below the liquid supply
C.above the liquid supply
D.any of the above