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单选题
在对柴油机经济性分析中主要使用下列性能指标()。 ①有效功率; ②有效热效率; ③有效油耗率; ④机械效率; ⑤指示热效率; ⑥指示油耗率。
A
②+③
B
①+④
C
⑤+⑥
D
①+②+⑥
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