机载设备包括无线电通信和导航用于学员飞行员获得航空管制和导航仪表的基本技能。

Onboard equipments include radio communications and navigation for the pupil pilot to gain the basic skills of flight control and navigation instruments.

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用该法制备的减反射膜光学性能优良，生产设备简单，原料价格便宜，适宜在平板和真空管集热器玻璃表面上大面积涂覆减反射膜。

This method is charecterised by its good optical property. simple equipment, low cost of raw material and would be in practical use for large area antireflection coating preparation.

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美国空军批准的民航空管数据链通讯设备。

Data Link Communication Equipment Approved by USAF for Civil Air Traffic Control.

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