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

2??????????

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

4?????Vp

5????????

???????????1????????1???????????????? (??????????? ???????)?????1??????????????1????,?,?????22750?,????????????

??,????????????????????????????????????????????????????????,???????????????????????,??,????????????1????????????????10????

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

??????,?,????????????????????;?????????????????????????????????????????,??????????,?????????????????????,???,???

??????????,????????????,???????????,???????????????,??????????(????????????) ?????????:?????????????????