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

2???????

3?????????

4???????

5??????

?8??????28???? (? ??)??28??????,????????????,????12??,?????2.5??(??,???????????????????)?

?,?,??????8???????24????27??????,?,????“?”??????“?????????”??5??7?????????????,????????????????20?56????????????????,??????????????????

?????????,??????????????,?????????????????,???4??????????8??????????????????2.5????????????,????????????????,??????????

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