????λ?????? > ?????? > ?????? > ??????? > ????????????????η???
????????????????η???
???????????????????4??5??????????????л??????????3??4???????棬??????????????????????????????????档????????????????????棬??????????????????????????????????????????????????????5??6???9??10???????Σ??????
???????η?????
1???????3?????????Σ?????80%?е?η????1000??1500?????90%????а??800??1000??????????1?????ι???????????????30%?????????????1000?????
2????????Σ???????????????
