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

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

3???????200??500

4?????vx

5???????

????????:?????11???22??,???????10?????,???31.9??,?14.5%?????????????????,??????????7.9????,???48.0%;?????????????4.9??,???20.3%?110????,??7181????,???????????8.3%;??4502??,????20.7%?

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