?????? ????? PN10 PN16 ????? ?????? ????????? ????????

???? ???? Shijiazhuang Deye Piping Industries Co., Ltd. ?????? ?? ?????? ??????? ????? ??????? ??? ?? ??? ?????? ??????? PN10 ?PN16. ?? ????? ?????? ?????? ??????? ?????? ??? ?????? ???????? ??????? ?????? ????????? ??? ?? ?????? ??????? PN10 ?PN16 ?????? ??? ?????? ??????? ????? ?? ?????????? ??? ?? ??? ?????? ?????? ??????? ???? ????? ????? ????????? ?????????? ???????. ????? ??? ???????? ????? ??????? ??? ?? ??? ??????? ???????? ???????? ??????? ????? ?????? ???????? ?????? ????????? ??????? ?????? ????????? ??? ?? ????? ?????? ??????? PN10 ?PN16 ?? ???? Shijiazhuang Deye Piping Industries Co., Ltd. ????? ????????? ???????? ???????? ?? ??????? ????? ??????. ??? ?????? ???????? ????? ???? ???? ?? ?????? ???? ???? ????? ??? ?????? ???? ?????? ?? ??? ??????? ????????? ?????? ?? ??????? ?????? ??? ?? ???????? ??????? ???? ???????? ??? ???? Shijiazhuang Deye Piping Industries Co., Ltd. ????? ??????? ?? ??????? ??????? PN10 ?PN16 ???? ???? ???? ?????? ???????