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

2??????????

3??????????

4???????

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

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

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

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

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

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