單項(xiàng)選擇題

Trunk type diesel engine pistons are effectively cooled when heat is（）

A.radiated through the engine block
B.transferred to water cooled cylinder walls
C.conducted through the piston crown
D.transferred to escaping exhaust gases

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單項(xiàng)選擇題

Maintaining the proper fuel oil temperature will result in （）

A.the elimination of valve wear
B.improved atomization
C.a decrease in cylinder blow-by
D.an increase in cylinder blow-by

單項(xiàng)選擇題

Air motion is induced in a four-stroke/cycle diesel engine cylinder to improve air fuel mixing, and is known as（）

A.supercharging
B.scavenging
C.turbulence
D.swept volume charging