?? ?!?? ?10??30?????????????????
????:1?????:??????200?????
2???????
3????????
4??????
5????????
?1????????????1??? ?????????(NBC)?,??1??????????????????1??,????????,??????????????????????????????????10????30?????
?????????:???(NBC)??????,????,????????????,“???,?????????,???”?
?????????,???,?????????
?????????,????,????300?????
??????????????????:????????