?? ??????????????????
????:1???????vx:??????????
2????????
3?????????
4?????sn
5????????
??12??17??????????????(????? ?)??????????????????17???????????
??:??23?????18???????????,??????????????,????
???????????:??????????????23???????????????????12????????????????18??????????,??
?????,?????,??????,????????,?????????????,?????????????????????(????????????) ??:???????