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

2????????

3?????????

4?????????

5??????????

???????12????????????19??? ??,?????????????????????,????????,??????????????????????10?,????12~15???;??,????0??????????????????,???????

???????,??????????????,????????????????????????????????????????????????,?????????????????????3~4????0???,????,??,??????????

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?????????????????19-21????,??,??,??????????????????????????????4~6?,??2~4?,??,????????????????????????6~8?,??????10????????????????????????????????????????????????4~5????,????6~8????????

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