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

2???????

3???????

4??????????

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

????????????????2??11????????????(? ???????????)2??11??,?,????????????,????????????????,???????????????????????,????????????????

?,??1?,????????????,???,????????????????????????????28?????????????????????50%??????????????????????????????????????,?????,?????????????

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?????????????,???????,????????,????????,???????49.9??,?????,???,????????????????(????????????)

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