???? ???????????? ???? ????
1. ?????? ?????
2. ????? ?????? ?????
3. ????????
4. ??????? ????, ???-??????? ????, ????? ??????? ?????? ??? ??????????????????? ????? ??.
5. ?????? ????????? ?????? ???? ???? ??????? ???????? ??????? ??? ??: ?????? B(3-5)ln, ?????? C(5-10)ln, ?????? D(10-20)ln