Which of the conditions listed would cause simultaneous high cylinder firing pressure and low exhaust temperature?（）<br>A:Improper fuel rack positioning<br>B:Lengthy opening of the exhaust valve<br>C:Excessively early injection timing<br>D:Extended light load operation

Which of the conditions listed would cause simultaneous high cylinder firing pressure and low exhaust temperature?（）
A:Improper fuel rack positioning
B:Lengthy opening of the exhaust valve
C:Excessively early injection timing
D:Extended light load operation

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