?? ??????????????!?????
????:1???????????:???????
2?????,600??????
3?????vx
4??????????
5?????
?????11????20??,??????????????,?????«????????»?
?????????,???????,????,??????????????????????«??»,????
????4????????????,??????????????????????,???,???????«??????????????????»????????????????????????????????????,?????
??????????,???,????
??????????????:??? ????????????:??????