單項選擇題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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1.單項選擇題What causes diesel fuel to be ignited in the cylinder of an operating diesel engine?（）
A.Spark plug
B.Heat of compression
C.Carburetor
D.Glow plug
2.單項選擇題If a diesel engine fails to start，one of the likely causes is （）
A.low compression temperature
B.low ambient air pressure
C.high lube oil pump pressure
D.high fuel oil booster pump pressure
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