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????? ?? WC ????? ?500-600 C °. ??? ???? ???? ?????? ???? ??? ?? ?? ??? ????? / ????? ????????????? ?????? (HF / HNO3) ??????? ??? ????????? ???. ??? ???? ?? ?? ?????? ????????? ??? ????? ??? 400 ° C (752 ° F), ???? ????-??????? H2 ?? ????? ????? ???. ??"? ??????? ????? ??? ???? ?????.

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