?+?2?????????17???,??????,?20?????“??????????????????”???????????????????

???,?????????????50%?,60%???,70%???????????????,80%????,90%?????????,?????,????????????,??????????????,?????

?,????,???

??????????????? ?????????

??? ??

????? ?????

? ???????

??? ?????

????? ?

???? ??????? ??? ????? ????????? ???

?????????????? ?????????

??????? ? ????????:??????

??

??:???????????,??????????,??????????????