问答题何谓Pilot喷射，其目的和基本原理是什么？分析采用Pilot喷射时PM恶化的原因。
问答题
何谓Pilot喷射，其目的和基本原理是什么？分析采用Pilot喷射时PM恶化的原因。
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解析：
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相关考题：
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