Which statement about diesel engine combustion is true?（）<br>A:Combustion does not begin until the piston starts down on the power stroke<br>B:Maximum combustion pressure is reached before TDC<br>C:Turbulence in the cylinder causes a delay in ignition<br>D:Maximum cylinder firing pressure is not developed until the piston passes TDC

Which statement about diesel engine combustion is true?（）
A:Combustion does not begin until the piston starts down on the power stroke
B:Maximum combustion pressure is reached before TDC
C:Turbulence in the cylinder causes a delay in ignition
D:Maximum cylinder firing pressure is not developed until the piston passes TDC

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