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

2???????

3?????sn

4??????????

5?????

?????,???????,??????,?????????150?????

??,???????????????48??????,????5%????????,????????????????20%????????????

???????12306???????????,???????????,?????????????????????????,??????,????

???????????,???????4?????:

???8???????,?????????;

????48???????????8????????????????,?????????5%?????;

?????24??????????????48??????,?????????????10%?????????;

????24????,???????????20%???????????????????????

??,??8??,???????8?????,???,??????8?????,??5%????????????

?????48??????????????,???????5%????,????20%?????????

????????????? ???????:????????????,????????,?????,??????????,??,?????,??????,??????????????????20%????????????????????,???,??,?????????5%?????????????????,???????????,?????,?????????

(??????? ?????)

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