??
?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??????????????