????,??,??????300???,????????????“???”????????????,??25000??,??????????????????,?????????12?????,?????????3???(????????)
??:????????
??WTI????50???????
??WTI????50???????
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????:2016???147??10?10?
??:??“????”???????“??”
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?????????5.5%??????1????
?????????????????????
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?????????????????????20%
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???:???????U23??????????
????5?????:???????9??