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Which pump must always be primed ________．
A.Centrifugal pump
B.Reciprocating pump
C.Rotary pump
D.All of the above
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pump must always be primedB
volute must impart a radial and rotary motion of the water suction sideC
connection must guide the liquid to the lantern ringsD
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单选题With reference to a radial piston pump, which one of the following statements is false?（）A
Surrounding the fixed shaft is a hollow shaftB
This hollow shaft carries radial boresC
Each bore is fitted with a well-lapped plungerD
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each fire station dischargeD
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one fixed hand pump and one portable hand pumpC
two portable hand pumpsD
either A or B
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only the replacement of the entire pump would be acceptableB
the injection pump and injection nozzle must be replacedC
either the barrel or plunger must be replacedD
the barrel and plunger must be replaced as a unit
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