????? Pn25: ???? ??? ???? ?????? ??? ?????? ????? ??????

????? ???? Shijiazhuang Deye Piping Industries Co., Ltd. ?????? ????? Pn25 ????? ?????? ???????? ???????? ????????. ?? ????? ??? Pn25 ?????? ??? ?????? ????? ??? ????? ?????? ??? ???????? ?? ???????? ?? ???? ??? ???? ??? ??? 25 ???? ??? ??????? ???????? ???? ????? ??????? ??? ?? ??? Pn25 ?????? ??? ?????? ????????? ?? ??????? ?????? ??? ????? ?????? ??????? ??????????. ????? ?????? ??????? ??????. ????? ?????? ?? ?????? ?????? ?? ??????? ???????? ?????? ????????? ??????? ????????? ?? ??????? ????? ??? ?????? ??????????? ???? ??? Pn25 ????? ????????? ????? ????? ???????? ??????? ???????. ????? ??? ?????? ?????? ?????? ???? ???????? ??????? ??????? ????? ??????? ???????? ??? ???? Shijiazhuang Deye Piping Industries Co., Ltd. ???????? ????? Pn25 ?? ?????? ?????? ???? ???? ????????? ???????. ???? ??? ????? ?????? ?????? ?? ??? Pn25 ?????? ??? ???? ???? ?? ???? ????? ???????? ?????? ??