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

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

3??????????

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

5???????

???2???????????????11????????????????(??????????????????????? ????????????????????????????????)2?11????????,??????,????????????,????????????????,???????,???

?????,?????????????????????1???,?,??,??28?????????????50%???????????????,????????,????????????????

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

?,????????????,??,???????????,????????????49.9?,??,?????,?????????????(?????)

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