A. asoutputpressureincreases,overallefficiencydecreases B. asoutputpressureincreases,overallefficiencyincreases C. overallefficiencyisnotaffectedbyoutputpressure D. noneoftheabove
A. onlyfixeddisplacement B. onlyvariabledisplacement C. bothfixedandvariabledisplacement D. noneoftheabove
Actualdisplacementincreaseswithrotorspeeddown B. Actualdisplacementdecreaseswithrotorspeedup C. Actualdisplacementisconstantanddoesnotchangewithchangeinspeed D. Noneoftheabove
A. highpressureofoutput B. smoothandquiet C. lowcostofproduction D. Noneoftheabove
A. 对 B. 错
A. reliableperformance B. simpleconstruction C. lowcostofproduction D. alloftheabove
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