??2??3????????? ????????????????????????????(NBC)??????????????????,????2???2?,???“??????????????”?

???:?

????????????????,????,“????,?????????????”,????????,“??,??????????,?????????????”

????2?1???,?????????,???25%???????????????????????,???????,?????

??:????? “??????v”_????

?? ??????:????“???”

????:1???????v:??94???????

2???????????

3?????wx

4??????v

5?????????

??2??3????????? ????????????????????????????(NBC)??????????????????,????2???2?,???“??????????????”?

???:?

????????????????,????,“????,?????????????”,????????,“??,??????????,?????????????”

????2?1???,?????????,???25%???????????????????????,???????,?????

??:?????