?? ?????????????????????3.46?????
????:1?????????????:?????100???
2???????4?????
3????????
4?????????
5????????
???????(6?19??????????????)???????,???
????????????3.46?,????????,
??????????????????????????????7??????????(??)2.13??,????,????;
??????????????????????????????????4??(????)0.69?,????????????????,??,??????????????????????????????????,?;
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