单项选择题
The scavenging air ports are located at （） that they are just exposed by the upper edge of the piston when the piston is in the bottom dead center position.
A.so a height
B.such a height
C.so high
D.such high
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相关考题
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单项选择题
The rising of the exhaust temperature in manifold pipe may NOT result from （）.
A.too great a loading
B.fouled turbocharger
C.bad combustion
D.excessive air -
单项选择题
The rim of the piston may contain cut-out portions to accommodate （） when they open.
A.the gases
B.the air
C.the valves
D.the injectors -
单项选择题
The removal of （） from lubricating oil will reduce engine wear and possible breakdowns.
A.contaminating water
B.contaminated additives
C.contaminated fuel
D.contaminating impurities
