A centrifugal pump produces the required pressure energy by means of a rotating _____ prov

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• 1、Air leakage between the shaft and stuffing box packing in a centrifugal pump is prevented
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• 2、The gear pump belongs to the （) pump.A.positive displacementB.reciprocatingC.centrifugal
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• 3、The discharge head of a centrifugal pump will vary directly with the _____.A.change in imp
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• 4、A centrifugal bilge pump requires priming _____.A.primarily to lubricate the shaft sealsB.
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• 5、The advantage of a centrifugal pump as compared with a reciprocating pump is that _____.
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• 6、The function of a centrifugal pump double volute casing is to _____.
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