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

2????????????

3???????

4??????????

5???????

????????6?5???????? (??? ?)5???????,“???????????”??????????????,?????

6???????????5?,???????????????????????? ???????????

??,???,??8500???????????????

?????5?????????,???????????????,???????????5???????????17???????????,???????7992?,??93.7%???????5.4?,??454?????

“??1400???????????(1??????=500??),?????”???????????,?100??????????,??,?10????????????????,?????????????????????,???

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5????????,????????????????????????,?????????????,??????,?,?????

?????,?????5?????????????????,????5476???????????????????,??????60.8%?(???????????????????)

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