???? ????? DN700 ???? ?????? ???? 28 ???? ?????? ?? ?????? ???? ?????

??? ???? ??????? DN700 ???? 28 ???? ?????? ?? ???? Shijiazhuang Deye Piping Industries Co., Ltd. ?????? ??????? ?????? ?? ???? ??????? ?? ??????? ?? ???? ???????? ???????? ???????? ??? ?? ????? ???? ??????? ???? ?????? ??? ?? ??? ??????? ??????????? ??? ????? ??????? ?????? ????? ?? ????????? ??? ?? ??? ?????? ?????? ?????? ?????? ????????? ?????????? ???????. ????? ?????? ???? 28 ????? ??? ???? ?????? ?????? ?? ?????? ?? ???? ???????? ???????? ??? ????? ?? ???? ????? ??????? ???? ??? ???? ?????? ??????? ?????? ???????? ?? ????? ????? ???? ?????? ???? ?????. ???? ????? ?????? ????? ?????? ??????? ??????? ??? ???? ?? ??? ??????? ???????? ??? ???? ?? ????? ?????? ????? ???? ??????? ?????? ?????? ?????? ???????. ???? ????? ??????? ???? ?????? ??????? ??? ???? ??????? 28 ???? DN700 ?? ???? Shijiazhuang Deye Piping Industries Co., Ltd. ???? ??????? ????????? ?????? ?? ?????? ???????