Which of the following pumps are self-priming, and...
单选题

Which of the following pumps are self-priming, and can deal with liquid from a level below the pump? () (1) reciprocating (2) rotary (3) centrifugal

发布日期:2021-03-22

A.(1)only

B.(1)and(2)

C.(1),(2)and(3)

D.(2)and(3)

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