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柴油机排气阀在下止点前打开,其主要目的是()。

发布日期:2021-03-22

柴油机排气阀在下止点前打开,其主要目的是()。
A

排尽废气多进新气

B

减少排气冲程耗功

C

减少新气废气掺混

D

增加涡轮废气能量

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