Cu 5.36 PPM, Zn 26.78 PPM, Pb 0.242 PPM, CA 0.032 PPT, Hg 0.007 PPM; Cr 0.187 PPM (wheat grain).是什么意思_Cu 5.36 PPM, Zn 26.78 PPM, Pb 0.242 PPM, CA 0.032 PPT, Hg 0.007 PPM; Cr 0.187 PPM (wheat grain).在线翻译_英语_读音_用法_例句