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

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

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

???:???????????? “?????????”_????

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

????:1??????????:???????????

2???????????

3???????

4??????

5???????????????

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

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

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

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