??
??1????30???????????? ??(NBC)30????????,???30?????????????????????????29??????????????????,?????,???“???????”???
????????????1???????????????29????,????????????,??????1?30??????????????? ??? ?????????????????????????????????????????????,??????????????????60??4???????,?????3???
???30??????????????????,???????????????3????,????300???????,???????????????????,?????
NBC?,??,?????????????
???:?????????????
????????? ????????????:???30???????????????