?????? ???????? Pn25 - ?????? ????? ?????? ?????? ????????? ???????

?? ?????? ???????? PN25 ?????? ?? ???? Shijiazhuang Deye Piping Industry Co., Ltd. ?? ???? ???? ?????? ?????? ?????? ?????? ????????? ????????. ?? ????? ??? ?????? ????? ?????? ???? ??? ??? PN25? ??? ????? ??????? ??????? ??????. ???? ?????? ???????? ??????? ??????? ??????? ??? ????? ??????? ????????? ?? ????? ?????? ?????? ??????? ?????? ?????? ?????? ???????? ?????? ?????? ????????? ??????? ????????? ????????. ?????? ????? ??? ?????? ???? ????? ?????? ?????? ???? ?????? ??????. ?????? ??? ??????? ????????? ??? ????? ???? ?????? ?? ??? ??????? ?????? ?? ???? ??????? ?? ???? ????????? ????? ???? Shijiazhuang Deye Piping Industry Co., Ltd. ?????? ?????? ????? ?????? ????? ????? ??????. ?? ????? ?????? ???????? PN25 ????? ??????? ????? ????? ???????? ????? ????????? ???????? ??? ????? ?????? ?????? ????????? ???????? ???????? ?????? ??