????:1????51?????:?????120??????

2???????sn

3?????????

4??????????

5???????

???11???????22????? (?? ??????)????22??,9????????????????105,?????;???1.2%,??14.4%,???????????????????

????????,?????????20??(?????????????????????)??????,??????,???

??????????,???13??,??????????????????

????,19???????????????????(???????????????????????????)????123,??,?????????????18????????????????????,??????????????,19?????(????????????)??2.5%,??28.7%??????????????????????????

“??????????”??????????????????????????(????????????) ???????:????