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

????:??100????:????????????

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

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

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

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