?? ???:????818.6???,???????????48.8%
????:1?????????:???????
2????????????
3????????????
4?????vx
5?????????
??????????????11????????22???? ????22????????????????,????????????????????,??????
??????????????,???,??????????29?????????????,??????????????????????????????????????????15?????????????,???????
?????,???????????????,????,???????,?????,????????????????????????818.6???,?????48.8%;?????,???????488.5??,??78.6%?
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