???? ?????? ????? PN16 ????? ?????? ??????? ?????? ???????

?? ???? ??????? PN16 ???? ?? ?????? ?????? ???? Shijiazhuang Deye Piping Industries Co., Ltd. ?? ???? ????? ???? ???? ?????? ???? ??????? ?????? ?? ????????? ????????. ?? ????? ??? ?????? ?????? ???? ????? ????? ??????? ???????? ??? ????? ??????? ????????? ?? ????? ?????? ?????? ?????? ?????? ?????? ?? ??????? ??????? ????? ???? ??????? PN16 ????? ??? ?? ??? ??? ?????? ????? ???? ????? ??????? ????? ??????? ???? ?????? ??????? ?? ???? ?????? ??????. ??? ???? ?????? ????? ???? ???? ??????? ?????? ??????? ????????. ?? ????? ?????? ??????? ?? ?????? ??????? ??????????? ??? ???? ???? ????? ??????? ???? ????? ?????? ?????????? ???????? ??? ???? ???? ???? Shijiazhuang Deye Piping Industries Co., Ltd. ?????? ??????? ????? ??????? PN16? ??? ???? ??????? ?????? ?????? ??????????? ?????????? ???????. ?? ??????? ????? ??? ?????? ???? ???????? ????? ??? ?????? ?????? ?????? ?????? ????? ?????? ????????