?? ??????????? ??????????????
????:1?????:??sn??
2?????????
3?????vx
4??????????
5??????
???????????1?20?? ????????????,?,????????????????????????,???????????????????,????????,??;???????????????
??????????????
??,??????????????????????,?????????????????????1??
??
?????,???????,??,?;???????????????,????????????
????
1???20????????08?????????????21??08?,???????????????????????????????,?????,??????????????????(5~8????)????????????????????????????????????????????????????????4~6????,??7~8?(?1)?
????1 ????(1?20?08??-21??08??)1?21?08???22?08????,?????????????????????????????????????,????????????,??????(5~7??????????????)????????????????????????????????????4~6?(??2)?
????2 ?(1??21????08?????????????????-22????08????)1???????????22????08???????????23??????????08??,?????????????????,??????????,???????????????????,??(10~12?)??????????????????????????????????????????????????????????????????????????4~6?(????????3)?
????3 ????????(1?????22?????08??-23????08?????????????) ? ??:??