?????? Astm A105n: ?????? ????? ?????? ????????? ???????

??????????? ??? ???????? ???????? ????????. ???? ?????? ?????? ????? ?? ?????? ASTM A105N ????? ??????. ??? ????? ?????? ???? ??? ????? ?????? ???????? ???? ?????? ASTM International? ??? ?????? ?????? ????????? ?? ????????? ???????? ????????? ASTM A105N ?? ??????? ?????? ???????? ???????? ??????? ???????? ????????? ?? ??????? ????????. ?? ????? ?????? ASTM A105N ?????? ??? ????? ???? ????? ????? ??????? ???????? ??? ?????? ?????? ????????? ?? ?????? ????? ?????? ????????? ????????? ??????????????. ??? ???? ?????? ????????? ?? ??????? ????? ?????? ????? ?????? ?????? ?????? ASTM A105N ?????? ??????? ??????? ???? ?????? ??? ?????? ?????? ????????? ??????? ????????. ??? ??????? ???????? ???? ??? ????? ?????? ????? ????????? ????? ????? ?????? ?????????? ???????? ?? Shijiazhuang Deye Piping Industries Co.,Ltd.? ??? ??????? ?????? ??????? ??????? ????? ?????? ????? ????? ??????. ???? ??? ????? ?????? ?????? ?? ?????? ASTM A105N ???? ???? ?? ???? ???????