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