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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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