单选题As engine RPM is increased from idle speed to full load speed, which of the conditions listed will decrease?（）ACompression ratioBFuel/Air ratioCCompression pressureDLube oil pressure
单选题
As engine RPM is increased from idle speed to full load speed, which of the conditions listed will decrease?（）
A
Compression ratio
B
Fuel/Air ratio
C
Compression pressure
D
Lube oil pressure
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