单选题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 speedA(1)and(2)B(2)and(3)C(1)and(3)D(1),(2)and(3)

单选题
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)


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