??

??????????????????(24)?????????????????????????
???????????????????????????
???????????????

???1 ?? 2???? 3?? 4?????? 5??10%30%?? 6??????? ?? 7???? 8? 9?? 10???? 11????? 12??????

??
????
??????
????
?????????????????
????????????????????
????????
?????
???????i ?????????
???????????
??????????
???????????
?????
?????? ????????????????


???100??84???14?64??C36?0.7??0.6?32?6?0.5?0.02,?0.04,0.4????????I?????

???????????????????

??????????????????????????

?????????
???

???...

?? ???????k????39??40???????????????????????????????
?????????????????

?????? ?20???55-65%????????30??3?????????????????f?????????????????????
2???????????????????????????????????????

3????k????

??? ???????????

??

1??????????????-?????II?I???3-6?????

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

3?? ??2??

4??????????...

1.??????????????
2.?????????????
3.??????????
4.?????????
5.???????J??
?over the world ?????

?,?,??,?,??,,?,,????,,,,
???????????
??????????????????????????????????

???????????????????????????????????????

?????????????????????????????

???????????????12???????????????????????????????

???????????g??????????????????????????????????????

[?
????????????????????????????????????????????????c?...