lusuliya
2012年2月13日 15:29
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铋是一种稀有金属,英文名:bismuth ,化学符号Bi,原子序数83,原子量208.98037,属周期系ⅤA 族。铋的合成晶体非常美丽,表面通常有非常薄并闪光的氧化层。

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