????? 7991
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????? ??????? ???????? ??? ????? ?????? ???? ?????? ???? ?? ???? ????? ???? ???? ?????? ?????? ???????? ????? ???? ?? ????? ??? ?????. ???? ?????? ????? ??? ?????? ??????? ??????? ????? ????????? ??? ?????? ????????? ???? ????? ??? ???? ?????. ???? ??????? ?? DIN 7991 ???? ????? ???????? ?? ???????? ?????? ????????? ?? DIN 7991. ?????? ?? ?????? ????? ???????? ?????. ?????? ?? ????? ???? ?????? ??? ??? ??????? ????? ?? ?????? ???? ?????. ???? ????? ?????? ??? ????? ??? ?????? ????? ????? ???? ?? ????? ?? ??????? ???????.
????? ??????? ???????? ??? ????? ?????? ???? ?????? ???? ?? ???? ????? ???? ???? ?????? ?????? ???????? ????? ???? ?? ????? ??? ?????. ???? ?????? ????? ??? ?????? ??????? ??????? ????? ????????? ??? ?????? ????????? ???? ????? ??? ???? ?????. ???? ??????? ?? DIN 7991 ???? ????? ???????? ?? ???????? ?????? ????????? ?? DIN 7991. ?????? ?? ?????? ????? ???????? ?????. ?????? ?? ????? ???? ?????? ??? ??? ??????? ????? ?? ?????? ???? ?????. ???? ????? ?????? ??? ????? ??? ?????? ????? ????? ???? ?? ????? ?? ??????? ???????.
???? ???? Ximingyang? ????? Linmingguan? ????? Yongnian? ????? Handan? ?????? Hebei? ?????