???? ??? Gost ???? ?????? ???????? ?????? ??????
?? ???? ?? ?????? Gost ????? ??????? ?? ???? ??? ???? ?? Shijiazhuang Deye Piping Industry Co.,Ltd. ??? ???? ????? ?? ????? ?????? Gost Flanges? ????? ?????? ????? ?? ??????? ???????? ?????? ????????? ??????? ???? ????? Gost Flanges ?? ???? ?????? ????? ??????? ?????????? ?? ????????? ???????? ????????. ??? ????? ???????? ?????? ?????? ??????? ????? ????? ???????? ??????? ??????? ??????? ???????? ???? ??? ????? ??? Gost Flanges ????? ???????? ?? ????? ?????? ?? ???????? ??????????? ?????? ???? ?????? ??. ?????? ?? ????????? ??? ?????? ???? ?????? ???? ????? ?????? ???? ??? ???????? ?? ?????? ??? ???????? ???????? ????????
