题目内容

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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