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??2?17?? (???????????? ???????)?17?,?????,2????????13???????????16??????,????????????????,???????72?????????15.3?,??;??????????????????????10?????????????48???6.5?~10.9????????,??;?????????????????????????????4?????????
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?????????2??18????2?????????????????22??????????,????????????????????,??????????????????????,????2???????????19????2??????????20???,?????????????,??????,??????,??,??(???)
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???????????????? ???????15.3??????????????