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单选题

_______ is not a necessary step to use a VOR effectively for navigation.

ATo tune the VOR receiver to the frequency obtained from the appropriate aeronautical chart

BTo check the ground-based VOR station every time the pilot wants to use it

CTo identify the station to ensure proper frequency is selected

DTo determine that the VOR station is available and reliable

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正确答案：A （备注：此答案有误）

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