????:1???sn??:?????????

2????????

3???????

4???????100?

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

??9????????28? (?????? ??)????????28??,??,????????????????????

??24??????????

?9?28????????????????15?50??:9?28??????20??29?20?,???????3?(??50~80?),??(??120~150?),??30~60?,???

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

?9??28?15????40??,?????,9?28??????20??10?????????1???????20??,????????,??????????7-9?,???????????????????????????????????????????????????????????9??????????????????????10????

?????????

?28?15????30??:29??08??30??08??,??,???????????????????????????????8??????????????4??????????5-7??,?8???(?????????)

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