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

2?????300??400

3????????

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

5???????

?2???????12? (????? ?????)12?????????????????,?????????10?????????????,??????????5????

??,????19??56??????????,??,????

?,????????????10????6??,???4??????????????????????????5??,????,????5????

??,??????18????????20??,??3???(???????????) ????:????