【C9】A．breathingB．deliveringC．sendingD．pumping

The advantage of a centrifugal pump as compared with a reciprocating pump is that _____.

_____uses one or two high pressure pumps for all the cylinders with one more____ standby, while______have a separate high－pressure pump for each cylinder.

If a bilge pump is able to develop vacuum, but is unable to sufficiently pump out the bilg

An advantage of a helical gear pump over a simple gear pump is that the helical gear pump

The gear pump belongs to the （) pump.A.positive displacementB.reciprocatingC.centrifugal

The ______pump is usually used as the lubricating oil pump.A.turbineB.screwC.vaneejectorD.