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

2?????vx

3??????????

4?????

5???95?98???????

??????????,8??31?,????62?????????????????7??????1???8????31??????,????????????8.87??,??6.7%,?????????????????????,8?10??12??????????3???1600?????????;?????????6.7?,????,??

???,??????????????,??10905????,???636?????6.2%?????,????????????4.56??518.4??,??78.1%?10.7%?(?? ?)

?:????