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??????? ??? ???? ????? ????? ???? ?? ???? ???? ??? ??????? ?????, ??? ???? ?????? ???? ???? (WC) ???????, ?????? ???? (Co, Fe, Ni) ???? ????. ??????? ????? ??? ???? ?? ????? ????, ????? ????? ????????? ?????, ??????? ????? ???? ???????? ????? ????????? ?????, ?? ??? ?????? ???? ?????? ??? ??????? ????? ???, ??, ????? ?????, ?????? ????? ???? ??? ?????? ???. ????? ????? ????, ????? ??? ?????? ?? ?????? ????? ???????? ??? ???? ????? ??? ?? ??????? ????? ?????, ????? ?????? ???, ????? ????? ?? ????? ?? ?????? ??? ??? ????? ??????? ????? ?? ????? ????? ??? ?????? ????? ? ???????. ???? ??? ????? ?????? ?? ??? ??? ????? ??????? ??? ?????? ?? ??? ???? ???? ????? ???????.
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