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.
同时也是用于机制人工制砂、高等级公路、铁路、水利、机场、建筑、水泥、耐材、治金等行业生产优质石料。
Also used for mechanism artificially system sand, highway, railway, water conservancy, airports, architecture, cement, refractories, metallurgy industries production quality stone.
本论文所研究的贵州省荔波机场是以旅游为主的支线机场，飞行区等级指标本期为3C，远期拟扩建为4C。
Libo airport researched in this paper is a lateral airport with main intent to tour. The grade index in flight area is 3C at this date and 4C at a future date by scale-up construction.
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