单项选择题
A diesel engine cooling water system with a pH factor of 30 indicates a condition of （）.
A.slight acidity
B.slight alkalinity
C.excessive alkalinity
D.excessive acidity
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相关考题
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单项选择题
Fuel injectors used in heavy fuel oil systems are usually provided with cooling to reduce（）.
A.cold corrosion of the nozzles
B.fuel viscosity for better atomization
C.carbon accumulation on the nozzles
D.fuel detonation in the cylinders -
单项选择题
The rate of fuel injection in a diesel engine cylinder depends primarily on （）.
A.the size of the holes in the fuel nozzle
B.timing of the pump
C.supply pressure to the pump
D.shape of the combustion chamber -
单项选择题
The camshaft on a four-stroke/cycle diesel engine provides a means to operate the （）.
A.fuel injectors
B.exhaust valves
C.intake valves
D.all of the above
