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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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
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