单选题What is commonly used to create turbulence in a diesel engine combustion system?（）AShape of the piston crownsBIncreasing the compression ratiosCIncreasing the piston crownsDIncreasing the turbocharger gear ratio
单选题
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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