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

2??????

3????????

4????????vx

5????????

???????????????????,????????????,?????????????6?????????????????24??????,??????????????3??,??

????????????“????”??,???“?????????????”,????????“??????”??????????????????,?????????????????????,??????????????????????????????,????700????????????,??800?????????????200???????,??10????????,???????????,??,????,??“??????”??????????,????

?????????????????????????????,??????????????????????????????????????????????,??,??????“?????????????”???????????,???????????,??????????,?????????2300??????????????

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

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