????:1??????????:??????????

2???????????

3????????

4?????sn????

5??????????

???????????????9??25??? (???????? ??)?(9??????????25??),???????1000??,????????????,??33%?

?9???25????,????1000???????????????????????????????????

??????????????????,???,????5.5??????????,?98.5%,???260?????????????????????,??148%?

????????,??????????“????”??,???????????“???????????”;??,?????????????????,???,?,?????(?????????????????????)

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