?? ????:??????“???”
????:1???????:?????????
2?100????????
3?????????
4????????
5?????????
????????2????????????3??? ??(NBC)???????????????????,???????2?2???,?“????”?
?????????:??????????????,??,“???,??????????????????”,????????????????????????????,“????,??????????????,?????????????????”
?????2?1???,???,????25%?????,????,??????????
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