??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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