?????????????2???????????18??? (?? ????????)????18??????????????????,??????????,????????“????????????????????????????”,??????????,???????“?????”??,???,????
?“???”?????,??????????????,???,?????50??(??)??????????????,????????500????,???????????????1-3??????,?????????????0.3%-0.5%/????,????????????????????????,??????,?,?,??????
???,“???”?????????????????????????????????,?????????????????????????,????????,??????20??????(????????)???0.3%/?????,20???0.5%/????????????????????????????????????????????????
???????,?“??”??????????20?????????????????????(????????????)?,???20??????????????,???????????,?????????????????????????????????????????????????????????????????????(?????????????) ????:????
??????????:??????????
??WTI????50???????
????:2016???147??10?10?
??:???????????
??:???????????5??????
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???:???????????????
?????????5.5%??????1????
????????:????????????
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4S??????????????:????????
??:??????????????????
??????400?????????????
????5?????:???????9??
????????:??????2?????
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????2??????????2???
??????????????:??7????
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46???????????????????