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N B英英字典_N B剑桥英语解释_N B柯林斯英文解释_零六五六深蓝词典
零六五六深蓝词典

N B

零六五六深蓝词典

柯林斯词典

    Nb

  • 1. the CHEMICAL SYMBOL for niobium 鈮

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