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