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

2????????

3??????92?

4?????????

5??????vx

??8?23? (??)????23??1??7???????????????????,??7???50%?

????,????7???,???31.0??,??14.0%?????,????7.4??,??49.8%;??4.7???,???????19.8%?

????????????1????7???,??????????1994??,?91?????????????????1????????????7????,????????4158?(??,?????),??2.6%???2947???,?19.2%?(???)

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