單項(xiàng)選擇題

Which of the following pumps is used where a relatively high pressure and small capacity are required?（）

A.Volute pump
B.Diffuser pump
C.Regenerative pump
D.All of the above

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單項(xiàng)選擇題

The （） pump discharges a nearly constant amount of liquid regardless of pressure.

A.mixed-flow
B.axial-flow
C.centrifugal
D.displacement

單項(xiàng)選擇題

Which of the following operating features do displacement pumps bear if they are working under no-cavitation condition?（）
(1) output is almost directly proportional to speed
(2) they are self-priming
(3) they will develop a discharged pressure equal to the resistance to be overcome, irrespective of speed

A.（1）and（2）
B.（2）and（3）
C.（1）and（3）
D.（1），（2）and（3）

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