?????? 2.3????????????????????

????:??????300??:?????????

???????????????????12?18?????? (??????????????????????????????????????????????? ????????)??????????,???????,??????,???????????????

???????????????????11??,??,??6.6??????????????????,????????????2.3????,??99.5%???????,??609.9????

?????????,?????????,30??????“???”????????????,?????????,????????????????????????,??“???”?????????????????????????,??????????????

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

?????,???,?????????????????????5??«????»,?????10????????1???????«??»??????,???????????,?????????,????,?????(????????????????????????????) ?????????????:????