??53%??????????????

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??????(???????????????):6??17???????30????????????????,????????????,53%???????????????????

??????????????,?3.31?????????,??“?”?????????“?????????????”???“??????????”??????????4.8????,?????12.8???,???????????????1978??5.05%????????13.84%???4????,???????515????1000????,????????????,2019???????????????????2000??????????40%??????????,???????????????,4.5??????

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