What is commonly used to create turbulence in a diesel engine combustion system?（）<br>A:Shape of the piston crowns<br>B:Increasing the compression ratios<br>C:Increasing the piston crowns<br>D:Increasing the turbocharger gear ratio

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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