???? ??? PSB API 900# ???? ?????? ????? ?????

??? ????? ????? ???? ???? ???????? ???? ???????? ???? ??? ?????? API 900# PSB ?? ???? Shijiazhuang Deye Piping Industries Co., Ltd.. ?? ????? ??? ?????? ???? ?????? ???? ?????? ?????? ????? ?????? ????? ???? ??????? ??????? ?? ???? ???????? ????? ??? ?? ?????? ????? ??????? API? ??? ???? ??? ?????? PSB ??? ????? ??????? ????? ?? ????????? ????????? ??? ?? ??? ????? ?????? ??????????????? ?????? ??????. ?? ????? ??? ???? 900#? ??? ??? ?????? ???? ??? ???? ????? ????? ??????? ??? ???? ????? ??????? ????? ?????? ?????? ?????? ?????? ????? ?????? ?????? ????????? ??????? ???????. ???? ??? ????? ??? ??????? ???????? ?? ??????? ??????? ????? ?? ???? ????? ????? ???????? ???? ????? ?????????? ?? ?? Shijiazhuang Deye Piping Industries Co., Ltd. ?????? ??? ?????? ??? API 900# PSB ????? ?????? ???? ???? ???? ?????? ??????? ? ????? ???? ???????? ????? ???? ???????? ????? ??. ???? ??? ????? ?????? ?????? ?? ???????? ???? ?????? ??? ??????