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iren121
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28.11.2005 20:41
Subject:
per parts per billion
molecules occuring at only a few per parts per billion
Spasibo
operator
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28.11.2005 20:48
Parts per billion:
http://www.answers.com/topic/parts-per-billion?hl=per&hl=parts&hl=per
c.h.i.l.l.i.
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29.11.2005 5:41
http://www.multitran.ru/c/m.exe?HL=2&L1=1&L2=2&EXT=0&s=ppb
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