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

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

3??????????

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

5?????

?????????7???27???(??????? ???)????????????27?????????,?????????4×100???????????????????,????????????????????,???,??3???????11???????62?,????4×100??????,?????????????????,????3??34??31?,??????????400??,?,?3???????44??????60??????,????????????,????!

??????:??