???? ??????? ??????? ????? ????? Api 6d ?? ??? ?????? ??????????

??????????? ??? ???????? ???????? ????????. ?? ?????? ??????? ?? ???? ?????? ????? API 6D. ?? ????? ?????? ?????? ????? ?????? ??? ????? ??????? API 6D? ??? ???? ?????? ?????? ?????????? ?? ????????? ???????? ????????? ??? ?? ?????? ????? API 6D ?????? ??? ?????? ?????? ????? ?????? ????? ??????? ???????? ??????????????? ?????????? ???????? ??????. ??? ?????? ?? ?????? ?? ??????? ????? ????? ??????? ?????? ??????? ??????? ???????. ?? ????? ?????? ????? ?????? ??? ?????? ????? ???? ???? ?????? ??????? ??? ???? ??????? ????? ??????? ???????? ?? ??????? ????? ??? ?????? ???? ???????? ???? Shijiazhuang Deye Piping Industries Co.,Ltd. ????? ?????? ?????? ?????? ??? API 6D ????? ?????? ???? ?????? ??????? ?? ????????. ????? ???? ?? ??? ?????? ?????? ??????? ??????? ?????? ?? ????? ???? ?????? ?????? ?? ??? ??????? ???????? ?? ???? ????? ??????? Trust Shijiazhuang Deye Piping Industries Co.,Ltd. ????? ???????? ?????? ?????? API 6D ?????? ??? ??????? ?????? ????? ?? ?????? ???????