????:1??????400?4??:??????

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

3??????

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

5???????????

????????????10??30??? (?????? ?)?30?,28???,??????20???????????“????”????,??16??

28???,??“??????”?,?????????????????????????????16?,????????????????0.20????????????????????4.55???,?????????????????,??????????????????????????????????????7????,?????????????????????0.17??2.05??????,??????????1956????

???????????,?,???????30??2???????????????????????,???,?????????,??????????,??????????????????????????????????????????,???(?)???????????????????????,??,??,?????????????

????,????????????????,???????????12.04????????????,????????0.7??????2.5????,?????

??,??????????????,???????????????????????3????????????????(??) ??:????????