???? ??? ?????? ????? DN700 ????? ?????? ????????? ???????

???? ??????? DN700 ?? Shijiazhuang Deye Piping Industry Co.,Ltd. ?? ???? ???? ?????? ???? ??????? ????? ?? ????????? ????????. ???? DN700? ??? ?????? ???? ??? ??????? ?? ?????? ???? ????? ????? ?????? ??????? ?? ???? ??????? ?? ??????? ?? ???? ????????? ??? ????? ?? ???? ????? ??????? ?????? ???? ??????? ??? ???????? ??????????? ??? ???? ?????? ??? ????? ?????? ? ???? ?????? ?? ??????? ???????. ????? ?????? ?????? ???????? ??? ???? ?????? ????? ??????? ?? ??????. ??????? ????? ????? ???? ???? ????? ???? ??????? DN700 ?????? ?? ?? ???? ????? ????? ??? ???? ??????? ?????? ??????? ?????????. ???? ?????? ?????? ????????? ??? ?? ??? ????? ?????? ??????????? ??????? ?????? ????? ?? ???? ???? ???????? ????? ?? ???????? ?? ??????? ??? ???? ??????? DN700 ?? Shijiazhuang Deye Piping Industry Co.,Ltd. ??? ?????? ???????? ??? ???? ????? ???? ???????? ???? ?????? ?? ??????? ???????? ??????