If the earth suddenly ________ spinning, we would all fly off it.
A) had stopped
B) stopped
C) has stopped
D) would stop
第1题
A diesel engine is similar to a gasoline engine except that the former has no _____.
A.cross-head
B.cylinder
C.connecting rod
D.spark plug
第2题
Within the gasoline or the diesel engine, about () of the energy is used to drive the vehicle.
A.25%
B.33%
C.9%
D.all of the above
第3题
Fresh water is used for the cooling of cylinder jackets and () of the marine diesel engine
A.cylinder covers
B.lubricating space
C.crosshead
第4题
A.Crankshaft revolution
B.Type of engine (diesel or gasoline)
C.Distance a piston travels during a stroke
D.Number of pistons
第5题
A.ignition lag
B.engine horsepower
C.lube oil system pressure
D.specific fuel consumption
第6题
A.as much fuel as
B.less fuel than
C.less fuel as
D.more fuel than
第7题
The diesel engine is also called compression ignition engine because______.
A compression stroke is one of the four-strokes of a diesel engine.
B the diesel engine is ignited by the heat of compression not by spark .
C the diesel engine has a very high compression ratio.
D Both A and B
第8题
When was the gasoline engine ______ ?
A.found
B.discovered
C.invented
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