Ntau yam txheej txheem kho saum npoo tuaj yeem siv los hloov kho cov xim ntawm cov qhov rooj hluav taws steel. Piv txwv li, PVC txheej tshuab los yog electrostatic hmoov txau tshuab tuaj yeem siv los txheej txheej steel phaj nrog ib txheej ntawm ntoo grain los qhia qhov sov so ntawm cov qhov rooj ntoo.

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