A.a reciprocating pump
B.a vane pump
C.a centrifugal pump
D.a triple screw pump
第1题
A.corrosive deterioration of a bearing
B.inadequate air filtration
C.excessive ring and liner wear
D.excessive cooling of lubricating oil
第2题
A.valve loop
B.valve uniflow
C.valve overlap
D.valve grinding
第3题
A.dead band action
B.neutral zone action
C.range
D.on-off action
第4题
A.expansion valve to overfeed
B.compressor to knock
C.water regulating valve to fail
D.crankcase drains to plug
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