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

2?????600?????

3?????

4?????vx?

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

???,???200???????“??”,???

??800????????????,?????????????,???????42??????????????????,?????80%????????????????????,??95%??????????????????????????,????“???????????????????”????,???,?????????

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

???????:????????????