???? API CS ???? ?????? ????????? ???????? ????????

?????? ?? ???? ???? API 6A CS ???? ??????? ??? ???? ????? Shijiazhuang Deye Piping Industry Co., Ltd. ?? ????? ???? CS ????? ??? ?????? ?????? ???? ??????? ????????? ??? ????? ??????? ????? ?? ????????? ?? ???? ????? ? ????? ?????? ??? ????? ?????? ???????? ??????? ???????? ???????? ??? ???? ??????? ?????????? ?? ????? ????? ?????? ?????? ??????? ???????. ??? ????? ????? ???? ?????? ????? ????? ??? ???? ?????? ??? ????? ?????? ???????? ??????? ????????? ?????? ???? CS ????? ??? ?????? ?????? ???????? ????? ?????? ?????????? ????????? ????????. ??? ????? ????? ?????????? ????? ???????? ???? ?????? ?????? ??????? ????? ???????? ?? Shijiazhuang Deye Piping Industry Co., Ltd.? ??? ??????? ?????? ?????? ?? ?????? ?????? ???? ?????? ???????? ???????. ?? ???? ???? API 6A CS ????? ???? ???? ??????? ?? ??????? ????? ?????????? ???? ??? ????? ????????????. ???? ??? ????? ?????? ?????? ?? ???? CS ????? ??? ???????? ??? ???? ?? ???? ???????