[单选]
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

A . (1)only
B . (1)and (2)
C . (1),(2)and(3)
D . (2)and(3)

The amount of fluid delivered by a helical pump can be regulated by （）. throttling the pressure line。 changing the speed of the rotor。 either A or B。 None of the above is tree。怎样用肉眼来观察COG的燃烧情况？什么是碘泡虫病？ RLC并联回路谐振时，（）最小。导纳。电流。电压。电荷。怎样用肉眼检查看火孔压力？

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

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相关题目:

The amount of fluid delivered by a helical pump can be regulated by （）.
怎样用肉眼来观察COG的燃烧情况？
什么是碘泡虫病？
RLC并联回路谐振时，（）最小。
怎样用肉眼检查看火孔压力？

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[单选] 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

相关题目:

[单选]
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