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

2???????

3?????vx

4???????????

5????????????

??????2??13????????????????? (??)?13?????????????????????????????,?????????????????????“???????????”????“????????????????????????????”?????????????,????,?????????????

???????,??????«????????(??????????)»(??“???????????”),?,???

??????????????????????,“?”?????,???????????40%????60%,????????????????????????????“????”?“?????????????????????”??????????,??????“?????”,????????;?????????????????“?”,??????????

????????????????????????,“?????????”????????,?????????????,??,??????????????????????7%,???????

??,??????????????????????????????????7??????,????????

????,??????4000??,??,???????????????2000????????????????,??????????????????????????????;????????????,???800???????????,??????2???????????????????,?????100??????400??????

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