单选题Which of the following pumps is used where a relatively high pressure and small capacity are required?（）AVolute pumpBDiffuser pumpCRegenerative pumpDAll of the above
单选题
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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