在ICAO空域分类方案中，哪些空域是管制空域？（In the classification scheme of airspace recommended by ICAO, which classes of airspace are controlled airspace?）

中国空域分类方案中包括哪四类空域？（What are the four classes of airspace in the classification scheme of airspace in China?）

ICAO空域分类方案中包括哪七类空域？（What are the seven classes of airspace in the classification scheme of airspace recommended by ICAO?）

There is a tremendous strain on the air traffic system because the military are managing the airspace.

在ICAO空域分类方案中，哪类空域只允许IFR飞行？（In the classification scheme of airspace recommended by ICAO, which class of airspace only permits IFR flights?）

There is a tremendous strain on the air traffic system because the military are managing the airspace. A: 正确 B: 错误

中国大学MOOC: 26 A pilot entering Class C airspace is flying over an average-sized city.

3D printing can be applied to________. A: iological research B: text printing C: medical treatment D: airspace exploration

T or F 898[br][/br] This aircraft has not been allowed to enter the airspace due to its company. [音频]

在中国空域分类方案中，每一类空域的范围是怎样的？（What is the dimension of each class of airspace in China?）