??2???13??? ?,????????????????????????????????2?????????????13??,?????????,?,????1????,3???
????:????
??«??»,????????????
4S??????????????:????????
????????????????????
??WTI????50???????
????????:????????????
?????????6.5??????????
????5?????:???????9??
??:?????????????
??:???????????5??????
?????????5.5%??????1????
??????????????????
??!??????????????????
??????????????????????
????!??????????????
???????????:?15.60%??????
???????????:?????????
???:???????U23??????????
????!??????????????
?????????????????????
???????????????????
?????????6.5??????????
??:“??+????”?????????
?????????????????????
??????!??????????????
??:?????????????