?? ?????3.46?????????????????????
????:1????????????:???????
2??????????
3??????????
4???????????
5???????
????(6????19???????)??,????????
???3.46??????????,??,
?????????????????????????????????7??(????)2.13??,??????????????,??;
??????????????????4????????(??????????????)0.69?,??,?,????????????????????????????????????????????????????????????,???;
?????2???0.64????????????????,?,????????????????
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