????:1?????sn:??????????

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

3?????????

4?????

5?????????

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

??????????????????1??????????????6????? (?? ????????????????????????)?6??,???????????????????,??????????

???,??????????????????????2050?????,????2019??????,????,????40%?

??????????????,??490?????????,??7000??????????????????????????(1?????2.4????)??????????

?????????,?????????????????????30%?,??????,????

?????,?????????,??????(??????????) ????:???