Taw qhia: Hauv lub sijhawm no ntawm kev nce qib ntawm kev siv tshuab nrawm nrawm, qhov kev thov rau cov ntawv luam tawm yooj yim (PCBs) txuas ntxiv mus. Cov PCBs hloov tau yooj yim no muaj ntau yam zoo dua li cov laug cam, ua rau lawv siv dav hauv ntau yam lag luam xws li aerospace, tsheb, khoom siv hluav taws xob, ...
Nyeem ntxiv