??????1?????????????30???? (? ????)???????30??,29???
??1?29????????????????????????,????????????????????64??????????????????????,????????????3????,??????“???????????????????????????”?
????????????????????1???30????,?,?,??????1???????????29????????????????????????????????,???????????????????? ??? ?? ??????????,??????“?????,????”??,?????????????,???
?,????????????????(FAA)???????????“?,?,??”
????????????????2009????????2???????????????,?????????????,????????,?????49??1???(?????????????????)
??????????:?????????????????????????
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??????????????500????80%?
?????????«????»:?????10%
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3?29???????????
??????560?????????2000??
45????????????????????
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????2016???48.6???????4.3%
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3?29?16?????????
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??????560?????????2000??
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