Which of the following pumps are self-priming, and can deal with liquid from a level below the pump（） (1) ejector (2) screw (3) centrifugal<br>A:(1)only<br>B:(1)and(2)<br>C:(1),(2)and(3)<br>D:(2)and(3)

Which of the following pumps are self-priming, and can deal with liquid from a level below the pump（） (1) ejector (2) screw (3) centrifugal
A:(1)only
B:(1)and(2)
C:(1),(2)and(3)
D:(2)and(3)

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