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±ùµã½µÎÂ: ½ð±Ò+1, ллר¼Ò½â´ð£¬ÐÁ¿àÁË¡£ 2017-05-02 09:12:36
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HUO12345(±ùµã½µÎ´ú·¢): ½ð±Ò+5 2017-05-02 09:13:16
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   Na2SiF6 + 4H2O = 2NaF + Si(OH)4 + 4HF
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