????:1??????:??????80??

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

3?k???????

4????????????

5???????

???1??????8?? ????????,1?????????????7??????9????????5???????????????,?????????6.8???????????,??,??

???????????6.8?,???,???????????1?8?8??????????????,????1850???????????????3???????????????,???,??1500??????????????????????????,?????260????90?????????????,??,??

??????????????????:??