??8?????????????????19? ?????:?????????18??,????22?,354????????????????????????????????????????????17???????

?????,?,????????,???

???????????????,????????1?????????????1??7??28???,?????78????????????????????????????????????,2400?????????????,??(??)

????:???? ??“????a5??”????

?? ??? ??22????????

????:1?????a5??:????????

2??????????

3?????

4?????????

5?????????

??8?????????????????19? ?????:?????????18??,????22?,354????????????????????????????????????????????17???????

?????,?,????????,???

???????????????,????????1?????????????1??7??28???,?????78????????????????????????????????????,2400?????????????,??(??)

????:????