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

2?????vx

3??????

4????????????

5???98???

?6?????5????????? (?? ?????????????)5????????,?????,98???????????-50??????????,???,?????????????????,???,???????????

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

????????????,?,???4?,???92??????95???????,13??98????-50????

98????????????????????,?????????????????????????????????,???

?????,-50??????????????-48?,???????????????????,?“??????????????????”??????????????????,??????????,??????????????????,???????????????????(?)

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