题目内容

The onboard receiver picks up the VOR navigation signal to determine the aircraft's ____________________ from the station.

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A VOR station is oriented in relation to the Earth's _____________________ , but in the areas where the magnetic compass is not reliable, it is directed with respect to ____________________.

A VOR station can be identified on _________________ with a 360-degree-graduated compass rose.

Intersecting two radials from different VOR stations provides the aircraft _________________, and connecting specific radials from many VOR stations builds air routes called _______________.

关系数据库中,通过表与表之间的________来实现实体之间的联系。

A. 公共索引
B. 公共关键字
C. 公共属性
D. 公共数据记录

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