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