南海油气资源丰富,石油加工可得到石油液化气,假设某石油液化气的主要成分为C 4 H 10 ,写出其完全燃烧的化学方程式______;小明家欲将石油液气灶改为天然气(主要成分CH 4 )灶具,他空气______减小(填“增大”或“减小”)
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