????:1????????498:??????

2???????

3?????

4??????

5???????

?????6???????????????????14?? (??? ? ???????)???????14??????????????????,13???,???????????????????????????????????,???????????????21:14??(????????????),????,????????????????????????

?????????????????????,????????????????15???9??,???A?B?C?D??A?B?????????????,????????????????????

??????????????????????????????????????,????,???6???????????,??????3??????,??????????,??21?14?????????????(???????????????) ??:?????????????????????