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

2???????

3???????

4???24??????

5??????????

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

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

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

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

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