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

2??????

3???aa??????

4?????90????????

5?????????

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

??????????,??????????,???????????????,????80??100????????????????,??,??,??????????????????40%???

??????????????????????,???????,?????????????????????????,??????????????40????????,???????????????????60%??????????????,?????????????,???????????“??”?????????????????????

??,????????,??????????,??????????????????,?????????????,????????5????????,???????200????????????

??,???????????,????????????????????????????,?????????????,??,??????????,???????? ?????:?????????