?? ?????????????????
????:1???????100????:??????
2??????
3?????
4???????wx
5???????????
1??????28????????????????,??,??????????,??,1????????28????????0??????18???????,???????????????20.9%?26.7%???????,?????????????20??????,???????
?,?????????????????,???????,????,????,????????,???????????
????????,??????????????????????????????,??????,????????????????????????,????????????????????,???????????????????????????????????????,?????????????????????????????????????????????????????????,??????????,?????????????(?????) ???:????????????