????:1???????????:????vx

2??????????

3??????????

4?????VX

5???????

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

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

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

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

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