???? ??????? F51: ???? ?????? ?????? ?? ?????? ????????? ????????

?????? ??? ?? ??????? ???? ??????? F51 ???? ??????? ????? ?? ?????? ?????? Shijiazhuang Deye Piping Idndustrys Co.,Ltd. ?? ????? ???? ??????? F51 ????? ??? ??????? ????? ?? ????????? ????????? ??? ???? ????? ??????? ??????? ??? ??? ????? ?????? ????? ????? ????? ??????? ????? ???? ??????? F51 ????? ??? ?????? ??????? ?? ?????? ?????? ???????. ????? ?????? ?????? ???? ????? ?????? ??? ????? ??? ??????? ????????. ???? ?????? ?????? ???????? ??? ?? ??? ??????? ???????? ???????? ??? ?????? ????????? ?? ?????? ??? ????? ?????? ??????????????? ??????? ?????? ??????. ?? ??????? ????? ??? ?????? ???????? ??? ???? Shijiazhuang Deye Piping Idndustrys Co ., ????????. ????? ?????? ?????? ?? ?????? ?????? ????? ????? ??????. ?? ????? ???? ??????? F51 ????? ??? ?????? ???????? ??????? ????? ????????? ????? ????? ????????? ???? ?????? ???? ???? ??????? F51 ?????? ????? Shijiazhuang Deye Piping Idndustrys Co.,Ltd. ?????? ????????? ?? ?????? ?? ?????? ??????? ?????? ?????? ?????? ??????? ???????