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【多选题】
关于发动机排放污染物,下列说法正确的是( )。A.
CO是烃燃料在高温下燃烧的产物
B.
气缸壁淬排气中HC的唯一来源
C.
混合气过稀，可能使排气中HC浓度显著增加
D.
NOx是空气在燃烧室的高温条件下，由氧和氮的反应所形成的
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