單項(xiàng)選擇題

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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單項(xiàng)選擇題

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

單項(xiàng)選擇題

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

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Indirect cooling of fuel injector nozzle holders for diesel engines is accomplished primarily by （）.

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In a diesel engine cooling water system, a pH of 60 indicates a/an （）.

Which of the following statements concerning fire-tube boilers is correct?（）