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??????? ?? ??? ?????? ?? 19.3 (20 ° C), ?? ?? ???? ???? ????.?? ????????? ???????? ???, ???? ??????? ???? ???? ????? ???? ?????? ????. ????? ?????? ?? ?????, ?? ??????? 100% ???? ????.?? "???????" ???? ??? ???? ????? ?????? ????? ??????? ?????? ????.

????? ?????? ???? ??????? billets ?????? ???? ?? ??? ????? ????? ????, ??????? 70 ~ 90% ??????? ???? ????? ??? ??? ?? ????? ??? ?????, ??? 14 ~ 18 ??? 18 ~ 40 ??? ??????, ???????, 65% ? 95 ~ 97% ??????? ?????? ??????? ????? "???? ???????.