??? ??? ?? ????? M ???? 20 ??? ???? ??????? ???? ?????? ????? ??????. ????? ??? ????? ?????? ?? ?????? ?? ??? ?????? ??????? ???????? ??????? ????????? ???????? ?? ?????? ????? ????? ????. ??? ???? ???? ZHENNENG ??? ?????? ???? ???????? ??????? ???????? ????????. ????? ????? ??????? ??? ????? ??? ??? ??????????.
??? ???? ???? ???????? ???????? ??????????? ???? ??????? ???????? ???????? ????? ????? ?? ????? ????? ????? ????? ???????? ?? ??????? ??????? ????? SUS304? ??? 20 ??? ?? ????? M? ??????? ??????? ????? ?????? ????? ????? ???? ??????. ??? ?????? ????? ?????? ????? ????? ?????.
