?????? ?????? PN16: ?????? ????? ?????? ????????? ????????

?????? ?????? PN16 ?????? ?? ???? Shijiazhuang Deye Piping Industries Co.,Ltd. ?? ???? ????? ???? ?????? ???? ?????? ???? ??????? ????????. ?? ????? ??? ?????? ????? ??????? ????? ????? PN16? ??? ???? ????? ??? ???? ???? ??? ??? 16 ?????. ?? ????? ?????? ?????? PN16 ????? ??? ?? ???? ????? ??????? ??????? ??? ????? ??????? ????????? ?? ?????? ?????? ??? ??????????????? ????? ??????? ??????? ??????? ?????? ??????? ???????? ?????? ?????? (HVAC). ????? ?????? ???? ??? ??? ??? ????? ?? ??? ????? ???? ???? ?????? ?? ???? ?????? ??? ??????? ???? ????? ??????? ???? ?????? ??????? ??? ?????? ?????? PN16 ????? ??? ?????? ??????? ????????? ???? ????? ?????? ?????? ?? ?????? ????????? ???????. ??? ?????? ?????? ????? ?????? ?????? ????????? ??????? ????????. ????? Shijiazhuang Deye Piping Industries Co.,Ltd. ??????? ????? ??????? PN16 ????? ?????? ???? ???? ????? ?????? ??????????