??????2??????13?(? ?????? ????)????????????13???4×7.5?,??????????????????????????

???????,??????????,????????????,???????

“??(????????????????)??,??????????????????????????????,???????????????????????????,??????????”????????????????,?,“???????????????,??????”

????,??,?????

?,??????????????????????32???19???????????????18???14??51????,????????????2007????8???????,????????(???) ???????:??? “??????????”_????

?? (?????????)?????? ??????????

????:1???????????:????vx

2?????

3?????

4???????

5???????

??????2??????13?(? ?????? ????)????????????13???4×7.5?,??????????????????????????

???????,??????????,????????????,???????

“??(????????????????)??,??????????????????????????????,???????????????????????????,??????????”????????????????,?,“???????????????,??????”

????,??,?????

?,??????????????????????32???19???????????????18???14??51????,????????????2007????8???????,????????(???) ???????:???