工程中定義的“北”,未必是磁極“北”
按磁場定義的“北”,未必是地理“北”
地理中定義的“北”,未必是地軸“北”
工程中定義的“北”,未必是磁極“北”
按磁場定義的“北”,未必是地理“北”
地理中定義的“北”,未必是地軸“北”
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