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spare nozzle for furnace inspection

英 [speə(r) ˈnɒzl fɔː(r) ˈfɜːnɪs ɪnˈspekʃn] 美 [sper ˈnɑːzl fɔːr ˈfɜːrnɪs ɪnˈspekʃn]

炉内检视孔

化学

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