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

2???????vx

3?????????

4????????

5????

?????13??????,11????????????????,??,????????????32%,???????,??????????????

??,11??????????????32.3%,????????????????????183?????????????,?????????????????50%,???????????127??????,??70%???????????????????

??????????????????????,????,???,?????????16.8%,????????17?????????????????????????,11??28??????????????????,?,????10???????????????????7.7%???,?????????

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