?? ??????????4.7??? ???????
????:1????????:??sn??
2???????150???
3?????????
4?????????
5???????
?11??22? (? ??)?????11???22????????????20????????????????40?????????????4.7??????????,????????
???,11?22???20?40??????(???????????23.21??,???????????????120.23????)??????4.7???????????,???15????
??,?????????????????????????,??????????????????????????
??,?,?,??
????,?200??????5???4??????????321?,?2024????4?????3??????7.3?,?168???(??) ??????:?????