?? ??????????????!30???????
????:1?????vx:?????
2???????
3????????????
4??????????
5??????????
?????!????????????
1????30??????????????,????????,??????30%?17.1%,?????,?,???
????????,??????,????????????????????,????????????????????????????????????????,??????????????????????,??????:
??,????????????????
???,?????????,????????????????????????????,?????????????
?,??????,???????????????,????,???“???????????????????????????”?
??,1??30????2??????????2????????,?????????????????????????????,??????????????????????????????,?????????????????????,????????????,???“???????”,?????????????????,?????????
(????????? ??????) ????????:???????????????????