???? ??????? PN64? ?PN40? ?PN25 ???? ?????? ????????? ????????

???? Shijiazhuang Deye Piping Industries Co., Ltd. ?????? ?? ????? ?????? ?????? ??????? PN64? PN40? ?PN25 ????? ??????. ?? ????? ?????? ??????? ????? ?????? ???? ????? ????? ?? ????? ????????? ????????? ???? ????? ?????? ??????? ??? ???????? ???? ????? ?????? ????? ??????? ???? ?????. ????? ?????? ??????? PN64? PN40? ?PN25 ?????? ?????? ?? ???? ????? ?????? ?? ??????? ???????? ???????. ??? ????????? ??? ???? ???? ?? ?????? ??? ????? ?????? ??????????????? ??????? ?????? ?????? ??????? ??? ?? ????? ?????? ??????? ????? ????? ???? ????? ????? ??????? ???????? ??? ?????? ?????? ????????? ??????. ??? ?????? ?? ?????? ?? ??????? ?????????? ?????? ????????? ??????? ????????? ?? ??????? ??? ??????? ??????? ??????? ??????? ???? ???? Shijiazhuang Deye Piping Industries Co., Ltd. ?? ?????? ??????? PN64? ?PN40? ?PN25 ???? ?????????. ???????? ??????? ??????? ???????. ???? ??? ?????? ??? ???? ?? ????????? ??? ?????? ?????? ??????? ?????? ???