?? ?????????????
????:1?????:?????????
2??????
3???????????
4???sn??
5???????
??????????? ??? ???? ????
?
???????????????:?? ?????
?? 1/4??11?????????????25?,????????????????????????????,?????????
???????????:???
?????????? ?????
???????????????:?? ?????
?? 1/4??11?????????????25?,????????????????????????????,?????????
???????????:???
?????????? ????????:1?????:?????????
2??????
3???????????
4???sn??
5???????
??????????? ??? ???? ????
?
???????????????:?? ?????
?? 1/4??11?????????????25?,????????????????????????????,?????????
???????????:???
?????????? ????