单项选择题

What is commonly used to create turbulence in a diesel engine combustion system?（）

A.Shape of the piston crowns
B.Increasing the compression ratios
C.Increasing the piston crowns
D.Increasing the turbocharger gear ratio

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单项选择题

A.Spark plug
B.Heat of compression
C.Carburetor
D.Glow plug

单项选择题

A.low compression temperature
B.low ambient air pressure
C.high lube oil pump pressure
D.high fuel oil booster pump pressure

单项选择题

A.later and closing earlier
B.later and closing later
C.earlier and closing earlier
D.earlier and closing later