?? ???? ?????�???�?????????
????:1???????:?????????
2??????
3?????vx
4???????
5?????
???12???18?????? (?????????????? ?????????????)????????????????18?????????????????????????,???????????????????????????,?????????????,????�??�??
????17???????????????????????????????????????3????????????????,??5????????????????
?????????,????????,?????????????????,????????????,??????�??????,??????????12??????????,??????????�
??,??????????,???500?????�??????????????????,???�???�,????????????????????,??�
??????????????,???????????????????????,???????????????????????????????????????????,??????????????????????????????????????????????�????��???�???,????,????????????
????,?????????,?????????????????????,???(??) ??:????