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

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

6???????????????16????,?????????????,????????,???30?????50??????????????,???????

?,??????????????????????????,????????????,?,???,30%??,20%?????????????????????,??????“??,???????????????????????,?????????,??????????????????????????????????,???????”??????????????,????????,??????????????,?????????????????????,??CT??????,????????

??????,???,????B????????????,?????????????????????????????????,????5??????????,??,??????????,???????????

??????????????????? ??? ???????/??????????? ? ?????????????:?????????