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??????????9?4??(? ???)??????4??????20?????????,?11???“??”??????????????,5?~7??????,??????????

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??,4???????????~7???14~15???????????,?????“???????????”??16~17???????????????????????;5?????~7???,??,???????????????350~450????600???,??????????????????250~350???400??,???100~250??;????????????,5????~6?????,??????12~15??????????,5??~7???????????,?9~12????

???4?????????????20??????20?????????????????????????????????????

??4?16????(??????),??:???????????????????????????????????6.0~10.0?????????????????2.0~3.0??????????????????????????2.0~3.4?,?????(??) ??????????????:??????