题目内容

Infixeddisplacementvanepump,

A. flowrateisconstantanddoesnotchangewithworkingpressure.
B. flowratedecreaseswithworkingpressurerising.
C. flowrateincreaseswithworkingpressurerising.
D. noneoftheabove

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Whatistheadvantageofvanepumps?

A. smoothrunning
B. lowpulsationofoutput
C. quietoperation
D. alloftheabove

Balancedvanepumpsaredesignedtohave

A. fixeddisplacement
B. variabledisplacement
C. bothfixedandvariabledisplacement
D. noneoftheabove

苏联模式包括三个层次,分别是社会主义的基本制度、具体的政治经济文化制度、苏联特色的经济文化政治。()

A. 对
B. 错

Strokering(stator)ofunbalancedvanepumpis

A. round
B. elliptical
C. bothA.andB.
D. noneoftheabove