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

2???sn??

3??????????

4???????

5???????

??????11??????????27??? (??????)????????4?;??????,???;????????,???????????……?????????????,???????????31???????????,??????,???????????????????“???”?

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

??,??????????????,??????????????????,???????????,???????????????????????????????????4????,????????????????????,????????????,??????

??????????,???????2006?????????,??????????2?,??????GSM-R?????????????????????????,??“????????????”,??????“?????”?

???????????????,?????,????????????????????,??????,?????,????????????????????,??????GSM-R?????

????,????“???????????”?????????,????????2011??????????????,?????????????,?(??????????????????)?,??

????,?????,??????????????,????????2012????????????????,???????????????????“?????????????????”“??????????????”????????????????????

??????,????,?????,??????,??????,??26???????,?????????8?????????

??????31???,????????????????????????????????????????????,2023???????,?,????????????????????????????????????(????????)

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