题目内容

青春是用来（）的

A. 享受
B. 实现
C. 奋斗
D. 梦想

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Whatistheadvantageofpistonpumps?

A. highefficiency
B. highoutputpressure
C. bothoftheabove
D. noneoftheabove

Howarethepistonsarrangedinpistonpumps?

A. axially
B. radially
C. bothA.andB.
D. noneoftheabove

Swashplateisusedtochangedisplacementin

A. axialpistonpump
B. radialpistonpumps
C. bentaxispistonpump
D. alloftheabove

Displacementofaxialpistonpumpsarecontrolledby

A. valveplate
B. swashplate
C. eccentricityoftherotor
D. noneoftheabove