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??????17?????????7.2??????,????????????????17??????,????????????????????????????,??????????????49.7??,???66???????
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6???????6???????????????,??2.1??,???,??????????????????????,?????????????????????
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19????????,????????????,???24.2???,?????8????????????19??????????????,??,????
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??R4???????????????,?????????????21.3??,?5??,??,????????
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