题目内容
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 ____________________.
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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。
在关系表中，不允许记录中出现重复索引值的索引是________。
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