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2?????500?

3???????????

4?????????

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??????????6?????????15????? ??,??6?????????15??????????10??????????????:?????????????,6????15???14??16?????????????????14?????,?????????????????????????????????????????????????????????????????????????,??????????????????????????,???????????????(100~200??)?????????????(?????30~50??,??70??),?????????????????

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2??????,????;

3??,????????????????????,???????;

4????????????,??????

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