?????? ???????? ?????4
1, ??????? ?????? ??? ??????, ???? ?? ???? ???.
2, 60% ????? ???? ???? ?? ??? ????? ?? ????, ????? ??????? ?????? ?????? ????? ???? ?????
???????? furnce ???.
3, ???????? ??? ?? ?? accurantely ?????? ?????????? ??????, ???? ?????? ???? ??, ?? ???? ??? ?? ???? ????.