Polyvinyl Cawv (PVA) yog ib qho khoom siv zoo tshaj plaws thiab muaj ntau yam khoom siv hluavtaws uas yooj yim siv hauv ntau hom dej-raws li kev siv thiab kev siv. Qhov blog no tham txog qhov txawv ntawm PVA, thaj chaw ntawm PVA & rsquo; s ap ...
Saib ntxiv
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