题目内容
The VOR station identifier is usually a three letter string in ____________________.
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An VOR station is depicted on the sectional chart with circles, called _____________________.
The VOR provides better accuracy and reliability than NDB because its signals are less ________________________around terrains and suffers less _____________________ from thunderstorms.
VOR stations operate in the VHF band which limits their range to ____________________.
An extensive network of ground stations is need to provide __________________along the main air routes.
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