quiet day geomagnetic variations
... 快速地磁变化 rapid geomagnetic fluctuation ; rapid geomagnetic variation 静日地磁变化 quiet day geomagnetic variations 一种地磁变化记录仪 Kew-pattern amgnetometer ..
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短语
地磁静日变化
geomagnetic daily quiet variation
;
geomagnetic variation on quiet day
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