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How to Convert Ppm to Mg/Kg | eHow 話說, 每個人身邊都有三三兩兩的好友, 可以一起擼串兒,一起K歌,彼此吐槽,相互毒舌… 他們,可以說是一生中最美好的存在…… Brightside最近分享了一波歪果網友的友情,很甜很可愛也很搞笑了~ 我給奶奶買了一副炫酷的太陽鏡,她的老朋友們You can use both parts per million (ppm) and milligrams per kilogram (mg/kg) to describe the concentration of one compound dispersed in another. Scientists often use these units of concentration to provide information about the concentration of especially...
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