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【单选题】
采用降速运行是一项行之有效的节能措施,但要对柴油机进行优化调整,主要包括____。I.适当增大喷油提前角II.适当减小压缩比III.适当减小气缸油的注油量IV.采用喷孔直径较小的喷油器V.缩短对燃烧室部件的检修周期VI.适当降低喷油器启阀压力
A.
I+Ⅱ+V+Ⅵ
B.
Ⅱ+Ⅲ+V+Ⅵ
C.
I+m+Ⅳ+V
D.
Ⅱ+m+Ⅳ+V
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