magnetic annual variation
... 磁变年差 annual change of magnetic variation 磁年差 magnetic annual variation 平均温度年差 mean annual range of temperature ...
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短语
磁变年差
annual change of magnetic variation
磁周年差
[地物]
magnetic annual variation
;
annual magnetic variation
磁差年变化
annual change variation
;
annual change of magnetic variation
年磁差
[地物]
annual magnetic variation
地磁差值年变率
geomagnetic difference annual variation rate
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