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?????,2?????,????????0.1~0.5?,??????????????:?21.0~23.4?,?????????19.0~21.9?,????????????????????????

???????????????????,?(1?????????????????????????????????28????~2?????4????????),???????,?????,?????????2????3?????????????????~4??????????,??????????1?30????????~2????1?,????1?31????????????~2?1?????????????,????????????????2??1??????????

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