Raws li ib feem tseem ceeb ntawm tag nrho lub tshuab, PCB feem ntau tsis tuaj yeem tsim cov khoom siv hluav taws xob, thiab yuav tsum muaj teeb meem kev sib txuas sab nraud. Piv txwv li, kev sib txuas hluav taws xob yuav tsum muaj ntawm PCBs, PCBs thiab cov khoom siv sab nraud, PCBs thiab cov khoom vaj huam sib luag. Nws yog ib qho tseem ceeb ntawm c ...
Nyeem ntxiv