?????????????2??????7???????????
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?????257???,?????170????,???6????11??64???
??:??????????????
???????8?17??????????4??
???:?????????????????????
????????????470?:???3?1?
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????????:??1??8000?
??3?????????0.2%
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2017???????????:??????
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2017???????????:??????
??????????????????6???
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??:4?27????????
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???????100??????????1500