单项选择题
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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相关考题
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单项选择题
The （） pump discharges a nearly constant amount of liquid regardless of pressure.
A.mixed-flow
B.axial-flow
C.centrifugal
D.displacement -
单项选择题
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） -
单项选择题
Which of the following pumps will build up a bursting pressure or stall their motors if the discharge valves are closed?（） (1) gear (2) centrifugal (3) screw
A.（1）and（2）
B.（1），（2）and（3）
C.（1）and（3）
D.（2）and（3）
