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??? ?????? ?????? ?? ???? ????? ?? ????? ?????? ????? ????? ??? 250 ?-3000. ?????? ???? ???? ??????? ????? ?? 0.7-12 ??? ???? ???? ????? ?????. ???? ????, ???? ?????? ?? ????? ??????, ?????? ?????? ??-shanghai Shibang Mill ?? ?????? ??????? ????. ????? ?????? ????? ?? ?????? ?????, ??? ?????? ?? ????? ?????? ?????? ????? ????? ?? ????? ?????.
?????, ???? ?????? ?? ???? ?????? ?????? ?? ??? ??????? ?????? ??? ????? ?????? ??????? ???? ??????? ???? ?????, ?? ???? ??? ???, ??? ??? ???, ????? ??????? ??????? ????? ???? ????? ???? ?????? ????? ?????? ????? ???, ????, ?? ?? ????? ???? ????? ??? ????? ??? ????? ????? ???? ???????? ??????????. ???, ????? ??????? ?????? ??? ??????? ?????? ?????? ?? ???? ?????? ???? ????????, ??? ?????? ?? ????? ??????? ??????? ?? ??? ?????? ?? ?????? ????? ?? ??? ????? ????.
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