?????? ???：???? ??? ??? ?????? ??? ???? ????? ????? ????? ??? ??? ?? ???? ?????? ???? ?????? ???? ??? ?? ????? ?????? ????????
???? ??? 200-325mesh???? ??? ??? ?????? ??? ???? ???? ????? ??? ????? ?????? ?????? ???? ??? ?? ????? ????? ?????? ???? ?????? ???? ??? ?? ????? ?????? ???????? ??? ???? ?? ????? ???? ??? ????? ??? ???? ??? ????????? ???? ???? ????? ????? ????? ????? ??? ??? ???? ?? ?? ????? ????? ???? ??? ??? ???? ?70% ??? ?? ???? ?? ????? ?? ?50-60% ??? ?? ????? ????? ????? ??? ??? ?????? ??? ??? ??? ??? ??? ?? ???? ?? ??? ?? ????? ??? ????? ??? ??????
- 1. ???? ????? ?????? ?? ???? ??????? ???
????? ???? ???? ??? ??? ??? 20-30% ??? ???? ??? ??? ?????? ??? ???? ???? ??? ??? ???? ????? ???? ???? ??? ?? ?????? ????? ??? ??????? ???? ????? ?? ???? ??? ????? ??? ??? -
2. ??? ?? ?????? ?????
???? ??? ??? ???? ??? ?????? ???? ????? ?????? ??? ????? ???? ????? ??? ????? ????? ??? ?? ???? ??? ????? ??????? - 3. ????? ??? ????? ??? ?? ?? ????? ????? ????
????? ??? ?????? ????? ??? ??? ?????? ???? ????? ???? ?????? ???? ??????? ???? ??? ?????? ????? ????? ????? ??????? ???? ????? ????? ??? ????? ??? ???? 15% ????? ???? ????? ????? ??? ????? ??? ?? ??????? ??? ???? ?? ??? ????? 3-4% ?? ????? ???? ????? - 4. ???? ??? ?? ?? ????? ??? ???? ??? ???? ???
???? ????? ??? ????? ??? ??? ?2-3 ????? ??? ??? ??? ??? ?? ?15-20 ????? ????? ????? ????? ??? ????? ??? ???? ????? ????? ???? ????? ???? ?????? ????? ??? ??? ?? ??? - 5. ????? ????????? ???? ???? ???? ????
????? ??? ???? ?? ????? ???? ???? ???? ????? ????? ??? ??? ??? ??? ???? ??? ??? ??? ????? ???? ??? ??? ?? ????? ???? ???? ???? ????? ?????? ??? ??? ???? ??? ?????? ????? ??? ????? ???? ?? ???
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