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

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