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单选题
A reciprocating pump belongs to （） according to its working principle.
A
injector pumps
B
positive displacement pumps
C
centrifugal pump
D
centripetal pumps
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injector pumpsB
positive displacement pumpsC
centrifugal pumpD
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diameter of the impeller
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self primingB
positive displacementC
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单选题（）belongs to emergency power supplying equipments.A
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throttling the pressure lineB
changing the speed of the pistonC
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positive displacement pumpC
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