无交通管制的空域被定为等级F，而低于海拔5490米、不在机场附近的管制空域是等级 E。
Uncontrolled airspace is designated Class F, while controlled airspace below 5,490m above sea level and not in the vicinity of an airport is Class E.
无交通管制的空域被定为等级F，而低于海拔5490米、不在机场附近的管制空域是等级 E。
Uncontrolled airspace is designated Class F, while controlled airspace below 5,490m above sea level and not in the vicinity of an airport is Class E.
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