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