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

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

3????????????

4?????????

5???????

??11????????30??????? (???????????????? ???????????????)???????????????30??????????????,11???50%,??0.2?????,??6?????????????????50%?????,??????????????????

?????,????,?????0.3??0.9?????????????????????????;??;????????????????????????????????????????????????????

???,11??????,????50%,???????????????????,????,???????????60%????,????;?????52%???????????????,???????????;??55%????????????????,????????????????????????????,??

?,??,???????????????,??????????,?????????????????????????????????????????????,??????11??,??,???(???????) ??????????????????????:???