????:1??????????????:??????

2????????????

3???????

4????????

5????????

?6??????????????????????????21???????(??? ?)??,????????????21???????,?????9721??,???????“?”???????????????????????

6?????20????,???????????(?? ???????)

?????21??16????????,?44.1????????????????95%?????;????16??,??????????????

??????????????I???????,?????????????????????????9721?????????????????????,?2793?????,?68?????,???????189???????????

?250??,????20?????????????????,??????????????????,??????,????????????,???????“??????????????????,????????????????????”????,????????????,?????????????????,????,????????,?????????

????????????????????????????????????????????20???????,????????????????????????????????????????21?????????????20???,????,?12??????,?????????????,??

??,??????????????21??7???????????????16.19?????,???????????????????????????????,????,???????????????(??)

???:???