??????????????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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