单项选择题
Why is the ring belt narrower in diameter than the skirt of a piston designed for a diesel engine?（）
A.To allow for greater expansion due to higher operating temperature
B.To seal the cylinder against leakage of combustion gases
C.To provide an additional surface for oil cooling
D.To provide an additional strength for the crown and lower structure
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相关考题
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单项选择题
The effective pump stroke of an individual port-and-helix fuel injection pump is determined by the （）
A.fuel delivery pressure
B.pump plunger diameter
C.plunger control rack position
D.total pump stroke -
单项选择题
The upper section of a piston is called the （）
A.land
B.skirt
C.crown
D.plate -
单项选择题
Pitted reduction gear teeth having a deep blue color with evidence of overheating have been operated with （）
A.excessive speed
B.improper warm-up
C.extreme misalignment
D.inadequate lubrication
