?? 6?1000??1/4??????????????
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2?300????????
3??????????
4??????200??500
5?????
2??7?????????????,?1000??,?????????????????1/4????????????
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??:???2??7?????????????,?1000??,?????????????????1/4????????????
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2?300????????
3??????????
4??????200??500
5?????
2??7?????????????,?1000??,?????????????????1/4????????????
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