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¡±NaI began to ppt. at once¡°ÊÇʲôÒâ˼?
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xufund(½ð±Ò+5, ·­ÒëEPI+1): лл°ïÖú 2011-07-13 20:28:50
Mally89(½ð±Ò+1): ¸ÐлӦÖú£¡~ 2011-07-14 08:43:45
Here the "ppt." should be the abbreviation of precipitation, so the meaning of "NaI began to ppt. at once" is:

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