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

2???????

3???????

4?????

5???????

?2?2???????????? (?? ?????????????????)????(??????)???????????????????2????????????????????????????1????????????????,?????????????????

?????????????,??2??1?,??????,???????????????

?,?????????????????,???????????????,??

??????????????2??1?????,??????????????????????????90%???

2?????2?,?????????????????,?????????????????????(?????) ????????:????????????????????