?? ???????????????????5.1%
????:1????????:?????
2???????
3?????vx
4????????
5?????????
???????????10???????????????????14?? (? ????)????????????????14???????????????????,??????????4.62??????,?????5.1%?
????????????????,???????????????,????????????????????????????8.6%?13.4%;???????????????14.4%?34.3%????????????????????,????????????????????????????
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