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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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3to10E
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填空题The ratio of a to b is the same as the ratio of 1.4 to 7. If a＝14, what is the value of b?____
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名词解释题凉闸站 station for cool brake
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