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单选题
The amount of fluid delivered by a reciprocating pump can be regulated by （）.
A
throttling the pressure line
B
changing the speed of the piston
C
either A or B
D
None of the above is tree
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injector pumpsB
positive displacement pumpsC
centrifugal pumpD
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the pump camC
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safety valves of marine boilerD
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单选题The amount of fluid delivered by a positive displacement pump can be regulated by （）.A
throttling the pressure lineB
changing the speed of the driving rotorC
either A or BD
None of the above is tree
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单选题The pressure head of a pump is given in the unit of （）.A
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MPaC
meter fluid columnD
None of the above is true
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