A.良好行为记录和不良行为记录
B.公共服务信息和市场监管信息
C.市场主体信息和市场客体信息
D.公众投诉信息和公众评价信息
第1题
A.excessive fuel pressure
B.high lube oil viscosity
C.inadequate fuel injection
D.excessive starting air pressure
第2题
A.excessive compression pressure
B.air in the fuel lines
C.high fuel pressure
D.excessive load
第3题
第5题
If a gasoline engine turns over freely but will not start,the cause is generally ______.
A.A defective ignition system
B.Low lube oil level
C.Weak valve springs
D.Too heavy a load
第6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7题
A.most critical in a four-stroke cycle diesel engine
B.most critical in a two-stroke/cycle diesel engine
C.most critical in a four-stroke/cycle diesel engine if it is turbocharged
D.of equal importance in a two-stroke/cycle diesel engine as in a four-stroke/cycle diesel engine
第8题
A the air is compressed in the sealed cylinder in the diesel engine
B the petrol engine has a comparatively very low compression ratio
C combustion occurs by spark ignition in the diesel engine
D Both A and B
第9题
The function of diesel engine piston compression rings is to _____.
A.prevent piston side thrust
B.prevent engine friction losses
C.transmit heat from the piston to the cylinder liner
D.remove oil from the cylinder combustion space
第10题
If a diesel engine rotates slowly when cranked, but does not fire, the____.
A.fuel control rack had admitted excessive fuel
B.engine speed does not match the fuel rack setting
C.engine has failed to reach its firing speed
D.starter pinion and ring gear contact is not correct
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