单选题High cylinder firing pressure, accompanied by low exhaust temperature, can result from （）Aimproper fuel rack positingBlengthy exhaust valve durationCextend operation at light loadDexcessively early injection timing
单选题
High cylinder firing pressure, accompanied by low exhaust temperature, can result from （）
A
improper fuel rack positing
B
lengthy exhaust valve duration
C
extend operation at light load
D
excessively early injection timing
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