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。A①+②+③+④+⑥B①+②+④+⑤+⑥C②+③+④+①+⑤D①+②+③+⑤+⑥
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
参考解析
解析：
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