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