????λ??????б???????
???????????????????????????????????????
???2??1?????????????????25%??3??????50%??4?????75%?????????????????????100%?????????????
??????????????4??????12YB??1????????????30YB???????????????????42YB?????1??2????????????????絽?г??????????????27YB??
???????г?????????????????粻???????????12YB???к?????????????27YB??2??????????????e???
????????????????????У?????????
?????????????????????????????????????????25%???????????????????????????????????5?????50YB??????100%??????3????30YB???????
????????????????????????????????????????40407???????40407????????
