单项选择题
Indirect cooling of fuel injector nozzle holders for diesel engines is accomplished primarily by （）.
A.heat conduction into the injected fuel oil
B.heat conduction into the water jacket wall
C.water circulation through passages in the holder
D.fuel oil circulation through passages in the holder
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相关考题
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单项选择题
In a diesel engine cooling water system, a pH of 60 indicates a/an （）.
A.slightly acidic condition
B.slightly alkaline condition
C.overtreatment of water
D.neutral condition of water -
单项选择题
Which of the following statements concerning fire-tube boilers is correct?（）
A.Combustion gases flow through the tubes
B.Flames impinge on the tubes
C.Combustion occurs in the tubes
D.Water flows through the tubes -
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
