单选题The arrangement and shape of the cams on a diesel engine camshaft directly control which of the listed groups of operating conditions?（）Aspeed, torque, and horsepower productionBfiring order, valve timing, and valve liftCfuel consumption, efficiency, and cylinder pressureDscavenge pressure, compression ratio, and exhaust pressure
单选题
The arrangement and shape of the cams on a diesel engine camshaft directly control which of the listed groups of operating conditions?（）
A
speed, torque, and horsepower production
B
firing order, valve timing, and valve lift
C
fuel consumption, efficiency, and cylinder pressure
D
scavenge pressure, compression ratio, and exhaust pressure
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