如图所示是铁丝在氧气中燃烧的全过程.请回答下列问题1铁丝为什么要绕成螺旋状2集气瓶内为什么要预先装�量水或铺一层细砂3描述 Template




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tomski如图所示是铁丝在氧气中燃烧的全过程.请回答下列问题1铁丝为什么要绕成螺旋状2集气瓶内为什么要预先装�量水或铺一层细砂3描述 coloring