???? ??? ?????? ????? BSPT ????? ?????? ???????? ???????? ??????

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