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

2????????

3???????vx

4?????????

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

?????????????????12??26?? ??,?????,?????????16.2????????????,??????????????4.7?????,??2.5????;???8000??,????????????3000???,?????2300??????

??????????,????????????????43??????????????,???11.7%????;??51.8????????,?????3%?????,?????

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