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28.50 氢化物、氮化物、叠氮化物、硅化物及硼化物,不论是否已有化学定义,但可归入品目28.49的碳化物除外
28.50 Hydrides, nitrides, azides, silicides and borides, whether or not chemically defined, other than compounds which are also carbides of heading 28.49


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