White smoke exhausting from a diesel engine can result from ________.A.high exhaust temper

The tradition of wearing white gown in the western wedding started from __________.A.Q

A diesel engine emits blue exhaust smoke as a result of ___________.A.cold intake airB.exc

Please ______ from smoking until the aeroplane is airborne.A．refrainB．preventC．resistD．res

White smoke exhausting from an operating diesel engine may indicate _____.A.a cracked line

Please ______ from smoking until the airplane is airborne.[1997]A．refrainB．preventC．resist

Black smoke exhausting from an operating diesel engine is an indication of poor combustion