工程中定义的“北”,未必是磁极“北”
按磁场定义的“北”,未必是地理“北”
地理中定义的“北”,未必是地轴“北”
工程中定义的“北”,未必是磁极“北”
按磁场定义的“北”,未必是地理“北”
地理中定义的“北”,未必是地轴“北”
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