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当甲烷(CH4)在空气中的体积分数在5%~15%之间时,遇火源才会发生爆炸.那么,在空气中点燃纯净的甲烷   (填“会”或“不会”)发生爆炸,这说明可燃性气体在燃烧的速率,与可燃性气体与氧气的   ...

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