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????? ????? A536 ????? ?????? ???? ?????? ???? Shijiazhuang Deye Piping Industries Co., Ltd.. ?? ????? ??? ?????? ??????? ?????? ?????? ????????? ?????? ?? ???? ???????? ???? ???? ????? ?????? ????? ???? ???????. ?? ????? ????? A536 ???? ?????? ??? ?????? ?? ???? ????? ???? ?????? ?????????? ????? ?????? ??? ?? ????? A536 ?????? ??? ?????? ?????? ????????? ????????? ??? ?? ??? ?????? ?????? ????????? ?????????? ?????? ?????? ???????. ??? ?????? ?????? ???????? ?????? ?????? ?????????? ?????????? ??????? ???????? ?????????? ?? ???????? ??????? ???? ???????? ???? ???? Shijiazhuang Deye Piping Industries Co., Ltd. ?????? ???? ?????? ?????? ???? ????????. ???? ????? A536 ?????? ??? ??????? ?? ????? ?????? ?? ?????? ?????? ?????? ?????? ???????? ???? ????? A536 ?? ???? Shijiazhuang Deye Piping Industries Co., Ltd. ?????? ??? ?????? ??????? ???????? ?? ????? ???? ???????? ?????? ??