????:1???????:???????????

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

3???????????

4????????

5????????????

????????2????????2?????????? ??(BBC)?????,?2????1????????????????,??????????????,??????????????????????????????????????25%???,????????????????

???,??????????,???????????1550??25%???????300???????2?????????????4??,1250??21???????????

???????????????,????????????,???????????

????,???,??????????????25%?????????,?10%?

?,???????,??,???? ??????:??