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

2???????vx

3???????

4???????

5???????

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

????,?,????????60%????????????????????,????????????????????????????,?????

??,?1800????????????6???6????????????????,?????6??????

?????????,??????????,???????,???????800??????

???????????????????????????,????????????????,?????????????,??????????21??????

6??????15?????????????,?????????????,?????,??????????????????,???????????????????,?????????????????74??????85%??

??????(6?16??)?,?????????????????417?????????????????,????????????????13?????????,??????????,??????????????? ???:???????????