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periodic permanent magnets
earth.sc.
周期性永久磁铁
periodic permanent magnet
gen.
周期〔性〕永久磁铁
;
周期永磁〔场〕
el.
周期排列永久磁铁
geophys.
周期性永久磁铁
mil., air.def.
周期恒定磁场
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