铜和铁是生产生活中广泛使用的�属.1下图是工业炼铁原理的实验示意图.气体a是 和红棕色粉末b是 .广口瓶中可观察到的现象是 用化学方程 Template




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tomski铜和铁是生产生活中广泛使用的�属.1下图是工业炼铁原理的实验示意图.气体a是 和红棕色粉末b是 .广口瓶中可观察到的现象是 coloring