????????????1??????????8?????? ?????(CBC)????????????????(BBC)???,??1??????????????7???????,???,?“?”?????

???:????????????

????,?????X????????:“?????????????,????”

??7?,???,????“???”????????????????

??,???,??“????????”??????,?????????????

??????????????????????:?? ??“???????????”

?? ???:????“????”???

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

2??????

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

4?????????

5??????

????????????1??????????8?????? ?????(CBC)????????????????(BBC)???,??1??????????????7???????,???,?“?”?????

???:????????????

????,?????X????????:“?????????????,????”

??7?,???,????“???”????????????????

??,???,??“????????”??????,?????????????

??????????????????????:??