??? ?????? ????????? ???? ?????????? ?????????????? ???? ?????????? ??? ?? ????????? ?? ???? ?? ????????(??)?? ?????? : ??, ??, ????, ??, ???? ?·???????, ?? ?????? : ?????? ?????????? ??·????????????? ???? ????? ??(?? ???? ???? ???? ???? ?????????????????????. ?????????????·????: ??· ?????? ????, ??·???? ??, ????, ???????????? ?= Time/interval