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????:1??????????:???????
2??????????????
3???????
4?????
5???????
???1????3? (??? ??? ???????????)????3??
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?????????????????15??????????,???????????????????????????????????
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?,???6.2??????????????,??,????????????550???????????????????????,???
??????,??,???????????????????????????????,?????????170?????????,????????????
????????????????,??,????????????????????,?????????????????????????160?????????????,???5????,?????6????????????????????,????10??????????????,???20%?(?????) ?????:?????