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

????:???????:????

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

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

???,??“???????????????”,“???????????????”?,????????????,????“??????????”?

?????????:??????????