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　　???? ?????? ??????? ???????? ?? ?????? ?????? ?? ??????? ??????? ?????. ??? ??? ??????? ???? ???? ?????? ???? PVC ? PTFE ? ETFE. ????? ?????? ???????? ??? ???? ?????? ??????????? ?????? ??????? ?????? ??????? ???????? ??????? ?????? ????? ?? ??? ??????? ? ???? PTFE ???? ???? ??? ?????? ??????? ?????? ?????? ???? ? ????? ???? EEFE ??? ???????? ??? ?????? ?????? ????? ????? ?? ????? ????????. ???????? ?? ???? ??????? ??????? ???: Q235 ? Q345 ???? ????? ?????? ????????? ????? ???? ?????? ???????? ????? ?? ???????.

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