A. smoothrunning B. lowpulsationofoutput C. quietoperation D. alloftheabove
A. fixeddisplacement B. variabledisplacement C. bothfixedandvariabledisplacement D. noneoftheabove
A. round B. elliptical C. bothA.andB. D. noneoftheabove
A. highoutputpressure B. lowcostofproduction C. smoothandquiet D. alloftheabove
A. 对 B. 错
A. Flowrate doesnotchangewithrotorspeed B. Flowratedecreaseswithrotorspeeddown C. Flowrateincreaseswithrotorspeedup D. Noneoftheabove
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