A.proper fuel metering
B.complete fuel/air mixing
C.minimal fuel penetration
D.proper fuel timing
第1题
A.smoky exhaust
B.starting failure
C.ignition relay
D.over speed
第2题
A.two or more impellers housed together in one casing and mounted on a single shaft
B.a single stepped impeller mounted in a progressively staged casing
C.a large radial clearance between the impeller and casing to prevent overheating due to
D.an increase in the discharge velocity of the liquid with a corresponding decrease in pressure through the stages
第3题
A.bearing knocks
B.dropping of pressure of LO
C.noises
D.all the above
第4题
A.water-tube
B.fire-tube
C.exhaust gas
D.none of the above
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