?????????2?3??? ????,???????????2???????????2????,?,??????????????109??????
??????:????
???????????(FAA)??????????????,??????,????,?,??,??????????????
??????????????????????,??104??????5????????????????????????:“?????????????,??????????,????????”???,????????????????
????:???
????!??720?????????????
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???????????????????????
????????3.3???????12??
??????????????????7??
??????????????????????
????????????????24657?
?????????????
????:2016?????????????
????????????100???
?????5??????44??????4????
??????????2????????5?
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2017???????????????????
?????????????????“??”
????????????????????1500?
4?5???????????
???????????6.1?????1?5?
????:????????????5???
?????????????????????
??????????????????7??
??????34?????????????
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