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

2???????

3???????????????

4????????vx

5?????

??1??????3???? (?????????? ?????????????????? ??????)????3???????

????????????,???????????????????????????????????????????????,??????????????????????????????????????,????????????????????“???????????????????????”??“?????”,??????????????????

????15????????,???????????????????????

???10??,????10???????“???”?????,?,????????????????????“?????????????????”?????

?,????????????????6.2????????????????????,??????,??550?????,????

????????,???,????????????????????????????????,??????170?????????,???

???,?????????,??????????????????,??????????????160????????,????5?,???????????6?????????,???10??,???20%?(????????????????) ???:??????????