?? ??????? ????? ????? ???? ????? ?? ???? ????? ???? ???. ??????? ???? ???????? ? ????? ?? ??? ??? ??? ?? ??? ?????/fluctuation|?? ??? ????? ???. ??? ??????? ????? ????? ??? ??? ???? ? ????? ???? ? ?????| ?????????? ????? ???? ???? ??????/????? ??? . ?????? ????> ????? ??????? ????? ???? ????