pvc?????????????????????

    ???PVC??????,???????????????,????????????????????????,????????PVC????????????????,??????????,????,??????????,?????????緶Χ????????.??????Щ??????,?????????PVC???????PVC?????????????????????????????ж???????PVC?????????????????.

    PVC????????????????????.??,PVC??????????????.????????????????????,????????????????????????????.?????????????????,?????????????????,????????????????.?????????????,?????????PVC?????(??????????????PVC),????????????????????????,?????????????????????????????. PVC?????з?????????????,????????????????????????.

    PVC????????????PVC??????????,????????,???????????,?????,?????γ??????????????.?????????????????,??????????,??????,??????????????????????????.?????????????????,????????????????,????????????.????????????????????????????,??????6??10?η???9??10?η?????????????????,??????4??10?η???6?η???????????????.???????????.

???????

?????????

??????????PVC??????????????


Top
©????????