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单选题
柴油机的实际循环与理论循环相比,实际循环热效率较低是由于存在()所引起的。 ①工质不同差异; ②气缸壁的传热损失; ③燃烧损失; ④换气损失; ⑤机械损失; ⑥漏气损失。
A
①+②+③+④+⑥
B
①+②+④+⑤+⑥
C
②+③+④+①+⑤
D
①+②+③+⑤+⑥
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