A.ignition ratio
B.power ratio
C.compression ratio
D.injection ratio
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A.nip
B.nap
C.gap
D.lip
A.less than
B.lighter than
C.larger than
D.smaller than
A.less than
B.lighter than
C.larger than
D.smaller than
A.smoky
B.a little bit dense
C.visible
D.almost invisible
A.the pressure of the starting air is high enough
B.there is enough air in the air reservoirs
C.the air is supplied into the cylinders in the appropriate sequence
D.all of the above
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Lube oil cannot be efficiently filtered if its （）.
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Combustion knock can occur in the cylinders of a diesel engine under any condition permitting （）.
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Engine protection by means of an alarm or shutdown control can be obtained with devices that are sensitive to （）.