推 ckhshooligan: 有答案ㄇ 01/04 10:33
推 ckhshooligan: 我寫D 01/04 10:35
→ ckhshooligan: 當我沒說，13520ppm應該是體積濃度ㄅ 01/04 10:37
→ sean20130124: 抱歉抱歉，答案是給C 01/04 10:42
推 chun10396974: (13520/10^6)/0.021 01/04 11:08
推 gamania0515: 1 ppm=0.0001% 1.3520%/2.1%=0.64=64% 01/04 11:13
→ lee457088: 文章要滿20中文字，記得補上喔~ 01/04 14:00
推 faniour: 1000ppm =0.1% 01/06 16:52