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????ľ???????????ʵ?ľ???ý????Ϊ?ã???ľ???д????????ʣ?ʹ???????ľ??????࣬?????Էֽ⣬??????????????г?˿??ÿ300???????Ҽ?һ????????????뼸?????۰?ã???????һ??????????ƻ??????ƣ?ʳ?ΰ?ѹ????У????????????У?ѹ?????????ˮֱ????û???ϲ???˿Ϊֹ???ܷ?ã????????죬????Ǵ???ʮ?????ϣ?????˿?ֽ?????????ɡ??????????Ŀ????ڽ??????????ټ?????ɻ?????20--30????Բ??䵰????֮???㣬????????????Ϊ?????״̬????????ţ?????ˮϸǮ?γ????ɣ??Ͳ?????????????????ˮ??û?ˣ?
ι??ʱ?????̫?ᣬ???Լ?????С?մ??кͣ???ÿһ?ٽ?????һ??С?մ??к?һ?¼??ɣ?ι??ʱҲ????̫??һ??????ȫ?ý?????ľ??ι????????Ӫ??̫??һ?ˣ?Ӫ??Ҳ??ȫ????????????????һ??ι????ľ???????????ϣ???????ȱ?٣??????????Ҫ???䵰?????ϣ??????????ڽ???ʱ?ͼ???һЩ???ɵȵ??????ϣ??ڽ????ͬʱ??Ҳ?Բ??ɺ????ɵȽ??????Ѷ???????
???????Դ?ľ?????????ι???IJο??䷽???????ο???40?????Ͽ?ʼι????ľ????40-100???䷽??????ľ??˿20%??????35%??????26%?????3%??????15%?????????1%???Ƿ?1%??Ԥ???????Ӽ?1%???????䷽?չ??˵???????????Ҫ???????ֻ??Ҫ????ľ???????ں??????ٶ???һ?㣬???Զ?һ?㽵????ľ????ֻ?Ƕ??ú??????????ж?????ʱ??Ҫ?ӳ???ʮ???????ϡ????ڽ????ж??һ?????ɣ????????䷽ʱ???????ټ?һ?㶹?ɵȰ????ԭ?ϡ???????䷽?У???????ü???????25????һ????????ģ????䷽ʱ?????????ӽ??????˿??????25%?????ɼ??ٵ?21%??
100?????ϵĴ?????????ľ??˿30%??????30%??????18%????????????ɣ?7%?????????12%?????????1%???Ƿ?1%??Ԥ???????Ӽ?1%?ȡ?
ľ?????õ??????????ǣ??Ƚ??鷳һ?㣩????Ƭ????˿????У?????ɹ?ɣ????????Ϊ???????????á??Ľ??????ɵ?һ?????ۡ?????????ȥ???????ᶾ?أ???????????Ҳ????ˡ?Ӧ?????ý??????Ч???൱?????????䷽ι??????һ??Ҫÿ400???????????ǵ??????м???һ???????Ͻ????????Ϊ?????䷽?У???20--30%?????۴????????????ã??????˳????????䷽?????۵?????????ʵ???????۵?Ӫ????ֵ?????ۻ????в??ٵIJ??ģ??????ý??????????????????ʣ????ֲ???????㡣ֻҪ??ι??ǰ??ÿ100???????????ϼ?120??ˮ??ʪ??ι?????ɣ???Ȼ??ʪ????һСʱ??ι??Ч?????á?
