?? ?21??????????????? ?????????
????:1??????????????:??????
2???????
3???????
4???????????
5???????
21??????????,???????????????????,?????,?????,?21???????????????????
9?24??28?????????,???21??????,?,????????????????15?,???????????????
????????????????,????10??,????2.3???????????????????,??????????????????????????????????????????????
???8???????????,???????2441.3????????,???21.8%,????52.6%,???
???????????????????????????? ??
????21????????????????????,???????????,????????????????????,????
??,?????????????????,??????????????????,????????????????????
??,????????,?????????????,????2100???????????,??????9?????????????,????????,??????????3.1????????,?????6500?????????????,??????????,???2?????????????????????
?????:??????????,???????????????????,?????????? ???????????????:??