???? ??? API 6D: ???? ?????? ????? ?????? ???????

???? ???? Shijiazhuang Deye Piping Industries Co., Ltd. ?????? ??? API6D ????? ?????? ????? ?? ??????? ?????? ???? ????? ????? ?? ????????? ???????? ????????. ??? ????? ?????? ????? ????? ????? ?????? API6D? ??? ???? ???? ???? ???? ?????? ?????? ???????? ????????? ?????? ?????? ????? API6D ?????? ??? ?? ?????? ?? ??????? ??????? ?????? ???? ??????? ????????? ??? ?? ??? ??????? ????????? ???????? ??????? ?????? ?????? ?????. ??? ?? ??????? ????? ????? ????? ?????? ?????? ??????? ???????? ??? ?????? ?????? ????????? ?? ?????? ????? ?????? ??????????? ???????????????. ?? ?????? ????? ???????? ???????? ???? ?????? ????? API6D ?????? ??? ??????? ??????? ???????? ????? ??????? ???? ?????? ??? ????? ?????? ???????? ?????? ?? ??? ???????. ???????? ??????? ???? ??????? ???? Shijiazhuang Deye Piping Industries Co., Ltd. ?????? ?????? ????? ???????? ???? ????? ????? ??. ???? ??? ????? ?????? ?????? ?? ?????? ????? API6D ?????? ??? ???? ???? ?? ???? ???????