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

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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