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kristyhy(½ð±Ò+4,VIP+0):лл£¬È·¶¨ÊÇË®ÈÜÒºÂð 12-3 10:56
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kristyhy

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kristyhy

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kristyhy

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55 ml ethanolic ammonia prepared by diluting 40 ml 25 % (w) aqueous ammonia with absolute ethanol to 200 ml.
7Â¥2009-12-03 11:20:36
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kristyhy

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ÁíÍâµÄ15% ethanolic ammonia (15:85 v/v EtOH:conc. NH4 OH)

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