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

2???????

3?????????

4?????200??500????

5??????

??????12?????????21????????? ????????????????????21?????????????,????,??????????????,?????????????????????6~8????,????????????9~11????;????,?????????6~10?,???????12????,???(-21.6?)?????(-27.1?)??????????????(-19.7?)???????(-17.6?)??(-20.2?)????,????

????

??,??????,???????????4~8?????????,??????????????????????????????????2~4??

????,????,???????????,???????????????????????????????????????7~8?????????9~10????,????9????????????????????10~11??????????????????

???????

??????,?,????;?????????????????????????;????,??,?,???????????????

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

???????:??