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28.53 其他无机化合物(包括蒸馏水、导电水及类似的纯净水);液态空气(不论是否除去稀有气体);压缩空气;汞齐,但贵金属汞齐除外:
28.53 Other inorganic compounds (including distilled or conductivity water and water of similar purity); liquid air (whether or not rare gases have been removed); compressed air; amalgams, other than amalgams of precious metals:


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