???
??????a???????????b????????????
?????????
????????????1??
??????????3??12????
????????1?????????????????????????1.5?2??????????????????30?60????????1?1.5?????????????????30?50?????????15?20???????????????????????????????????????????????????????????????????2?2.5???????????????????????3???12??????????????100?/???????????????30?40?????1??15????????7???????????
??????64????43????18????3???????95.3%?
?????
???????????????
?????????????????????0.1???0.2?????????????????0.2?0.5???????1?2???????????????C2??
??????135????8????64????54????9???????93.3%?
