Cov Khoom Qhia Qhia
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Kev soj ntsuam tsis zoo ntawm cov vuam hluav taws xob
I. Cov Khoom Siv Zais Khoom 1. Lub vijtsam luam ntawv lub qhov tawm ntawm qhov chaw nrog lub vuam phaj, thiab kev luam ntawv tsis raug, uas ua rau cov teeb meem cam tsis zoo ntawm PCB. 2. Lub lev tso quav tau raug rau cov dej ntau dhau rau hauv oxidizing ib puag ncig thiab nqus cov dej ntau hauv huab cua. 3. Tus nws ...Nyeem ntxiv