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（请给出正确答案）
Which statement is NOT true?
A.In a simple vane pump, the rotor and cam ring are exactly concentric
B.Balanced vane pump has an elliptical cam ring
C.Liquid in both gear pump and vane pump are forced out to the outlet.
D.Balanced vane pumps can work at a higher pressure than the simple vane pump
参考答案
更多 “ Which statement is NOT true?A.In a simple vane pump, the rotor and cam ring are exactly concentricB.Balanced vane pump has an elliptical cam ringC.Liquid in both gear pump and vane pump are forced out to the outlet.D.Balanced vane pumps can work at a higher pressure than the simple vane pump ” 相关考题
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Assumethetaghandlerforast:simpletagextendsSimpleTagSupport.Inwhatwaycanscriptletcodebeusedinthebodyofst:simple?()
A.SetthebodycontenttypetoJSPintheTLDB.ScriptletcodeisNOTlegalinthebodyofst：simpleC.Addscripting-enabled=“true”tothestarttagforthest：simpleelementD.Addapass-throughClassictagwithabodycontenttypeofJSPtothebodyofst：simple，andplacethescriptletcodeinthebodyofthattag.
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3、CAM植物与C4植物固定与还原CO2的途径基本相同，都有浓缩CO2机制。
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