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| I think it is due to pH value and the protected atomsphere. Normally, you should controll the pH value and the whole process should operate under nitrogen or argon ptotection. Besides, the bottle should be sealved. |
3Â¥2010-05-30 16:25:57
huang1987
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2Â¥2010-05-30 16:18:36
wudilang666
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4Â¥2010-05-30 17:45:28
wudilang666
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5Â¥2010-05-30 17:46:50













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