??? ????? ??????? ??????? ????? w, ????? ????? ?????? ?? ????? ??????? ???? w, ?? 80 ° ???? ?????. ?? ?? ????? ??? ???? ?? ????? ????? ????? ??????? ???? w, ??? ????? ?? ???. ???? ????? ?? ??? ????? ????? ????? ??????? ???? w, ??? ????? ?? ???? ?? ???? ????? ???? ????.??????? ?? w ??? ????? ??????? ????? ????? ?? ??????, chinatungsten ???????? ???? ??? ????? ?? ????? ????? ????? ??????? ???? w, ??????? ????? ??????? ????? ???????, ?? ??? ??????? ??? ??? ????, ??? ?? ????? ????? ?????.
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