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

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

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

4???????

5??????????

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

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

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

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

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