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【单选题】
下列关于排气系统的说法，正确的是（）。A.
三元催化转化器可将废气返回到进气歧管，以便重新燃烧废气中含有的有害气体
B.
排气歧管迅速降低废气温度，可提高三元催化转化器效率
C.
三元催化转化器可有效降低废气中的CO、HC和NOx的浓度
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