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huyi571236

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2Â¥: Originally posted by timegardener at 2012-10-27 02:48:09
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3Â¥2012-10-27 21:34:49
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timegardener

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ÒýÓûØÌû:
3Â¥: Originally posted by huyi571236 at 2012-10-27 15:34:49
ÄÇôppm = g/100mL Âð£¿...

ppm = g/1000000g
ppm = mL/1000000mL
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