单选题Which statement about diesel engine combustion is true?（）ACombustion does not begin until the piston starts down on the power strokeBMaximum combustion pressure is reached before TDCCTurbulence in the cylinder causes a delay in ignitionDMaximum cylinder firing pressure is not developed until the piston passes TDC
单选题
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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