High cylinder firing pressure, accompanied by low exhaust temperature, can result from （）<br>A:improper fuel rack positing<br>B:lengthy exhaust valve duration<br>C:extend operation at light load<br>D:excessively early injection timing

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

出自：海船船员证

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