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- 研究 (5)
- airplanes (1)
- design and construction (1)
- landing (1)
- landing gear (1)
- lift (aerodynamics) (1)
- performance (1)
- portance (1)
- private planes (1)
- runways (aeronautics) (1)
- social problems (1)
- supersonic transport planes (1)
- takeoff (1)
- testing (1)
- tires (1)
- traction (1)
- 农村经济发展 (1)
- 地区经济 (1)
- 工资水平 (1)
- 服务经济 (1)
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著者:
F. P. Kurochkin.
出版社:
National Technical Information Service,
出版日期: 1971.
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