单项选择题
A.affect the injection pressure
B.improve combustion
C.reduce compression pressure
D.decrease power output
单项选择题 All of the diesel engine cylinder firing pressures are normal, yet all of the exhaust temperatures are lowWhich of the following situations is responsible for this condition?（）
单项选择题 Which statement about diesel engine combustion is true?（）
单项选择题 Diesel engine exhaust gas temperatures can be used to determine individual cylinder （）.