单选题The ratio of the brake horsepower to the indicate of a diesel engine is its （）Athermal efficiencyBmechanical efficiencyCbrake thermal efficiencyDvolumetric efficiency
单选题
The ratio of the brake horsepower to the indicate of a diesel engine is its （）
A
thermal efficiency
B
mechanical efficiency
C
brake thermal efficiency
D
volumetric efficiency
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