?? ??????????????????
????:1?????????????:????vx
2??????????
3????????????????
4??????
5??????????
????(??????????????):??????????????,??????????????????,???
???,????????????????1????10???????,????????????328.8????????,??????19.8%?????????10?????????,????????1188.4??????????????????,????49.4%,??,??339??849???????,???????????????????????????????,?,??????????????
????????????,??,?????????????????????????????????????????,??????????????,????????????????,?????,??????????????,??????????????????
???:?????