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

2???????

3???????

4??????

5?????????

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

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

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

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

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