51吃瓜

?? ???requirements ????? ??????????? ????? ?? follow?: ???????????? ????????? ???????????? ??? ?? ????, ??? ??? ???? ??????????? ????? ?????????????????. ?? ????, ?? ?????????? ??? ?????? ??????????? ??? ?? ????, ???????? ?? ?????????? ??? ?? ??????????? ??????, ??? ?????? ????????? ??????????? ????? ??? ??????? ????? ?????????? ??????. ?????, ????? ??? ??? ?????????? ????? ??????????? ??????. ??? ????? ?? ?????????? ???????? ??????, introduce the requirements for material hardness. ??? ?????? ????, ?? ????? ?? ?????????? ??? ??? ??????????, ?? ?????, ????? ????? ????????? ?? ?? ?????????? ?????? ??? ?? ???????? ?????. ???? ????? ??? ?? ???????????????????? ?? ?????. ??? ?? ??? ????? ??? ??????????????, ?? ??? ??? ????? ???????????.

??? ?????, ??? ?????????? ???? ?????????? ???????????? ????????? ??? ?????, ??? ???? ???? ?????? ?????? ?? ????? ??? ?????????? ??????. ??? ?????????, ??? ?? ???? ???????? ???? ??? ??? ??? ??? ??????????????????? ??? ??? ????????? ???????? ??? ???????? ?????????????.

??? ????, ?????????? ?????? ??? ?????????? ??requirements ????? ?????????. ??? ???? ??????????? ????? ??????????. ????, ????????? ???? ????? ?? ???? ??? ????????? ???? ????? ?? ?????. ?? ??????????? ???????????? ??? ?? ????????, ???? ??? ??????????? ??? ??? ???? ????????.

???????, ??? ?? ????????? ?? ???????? ???? ?? ??????? ??? ??????????? ?????? ??????????? ??? ?????????? ???????? ????????????. ??? ??? ??????? ??? ?? ????, ??? ??????? ???? ???? ???? ????. ??? ????? ???? ?? ????????? ?? ?????, ???? ?? ??? ???? ? ???? ??? ?????? ???? ????? ???? ??? ?????????? ??????. ???????, ?????????? ??????, ??? ???????????? ???????????, ??? ???? ?? ???????? ???? ?? ?????????, ??? ?????????? ???? ????? ?? ??????? ?????? ??? ??? ?????.

????? ???????????????? ????? ?????????? ??? ????? ??? ???????????????. ?? ????, ?? ??????? strict ?????????? ????? ????нд?? ????????, ??? ?? ?????????? ??? ???????????? ???? ?????? ??? ??? ?????????? ?????. ?? ????? ???? ???????? ???? ?????????? ??? ????????? ????. ?? ????, ??? ??? ???????? ???? ?? ?????????? ?????? (??????? ?? ????????? ???????? ??????? ?? ?? ????) ??? ?? ???? ??? ???????? ??? ????????? ???????????????, ?? ???? ??????? ??? ??? ???????? ??? ???? ?????????? ???????? ??? ?? ????? ??? ???????? ??? ????????????? ???? ??? ????????? ?????????? ????????? ???????, ??? ?? ???? ???? ????????? ???? ????????? ??? ?? ????? ???? ??? ??квалифицированных ??????????, ????? ?? ???? ???? ??? ??linder ??? ?? ????? ????? ?? ????, ???????? ?? ????????? ??????????. ??? ????? ???? ???-??????????? ??????????.