?????????????? ??? ?????? ??? ?????????? ?????? ????? 1, ?????????????? ??? ?????? ????? material ?????? ??? ?????????? ?????? ?? ???, ????? ??? ????

2. ???? ?????????????? ???:

?????? ?????????????? 5A50 ???????? ?????: 265MPa; 3A21 ?? ?????? ?????: <167MPa;

????????? 2A11: 370MPa ?? ???????? ?????; 2A12: 390 ~ 420MPa ?? ???????? ?????; 2A13: 315 ~ 345MPa ?? ???????? ?????;

3. ????? ????? ???????????????? ???????? ?????: 80 ~ 100 ?????;

?.????? ????? ???? ?????? ?? ??????? ??????? ????? ????? ?'? ?????????? ????? ??? ??????? ??? ??????? ???? ??? ????? ????? ???????? ??????