?:??????9?10??????????????

??2?????3?????? ????????????????????,?,2??3?20??????4?20????,??????????????????5~6????7~8??,???????????????????,?????????6~8?????????????????????9~10??????????????????????????????????????????????7~8???????????????9????,???????9????????10???

2????4????????????20??5????20??,???????????????????????????????????????????5~6?????????????7~8????,??????????????????????????????????6~8???????9~10??;????????????????????????????????????????????????7~8???????????9??,??????9?????????????????10???????

????:

1???????,??;

2???????????????,??????;

3????????????????,?????????????;

4????,??????