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????:1????????????:????vx
2??????
3???????300????
4??????????
5?1800???????
?????????????6???????????????30???(?????)?,6??????????????????30??????7?????2???????????????????,?????????????????????????,?,?????????????????????????????????????????????????????????
????????,????????????????????,????????????????????????????????????????????????????????????
??50-90??,??120-180?????????????????,???????200??????;???30-70?,???100?,??????????????40-60?????
???,?????16????30??????????????????????????,???24???,???????????????,???
????11???????20??????,????24??????????????????????????????????????,??????????????????????????????????????????,??????????????????????
6?25????????????????????,????????????????,???????????????????????????????????????????????????????????,???????????????????????????????,???????????????;???????????????????????????????,????????????
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