permanent magnet bar code 永磁条形码 ; 永久磁铁条形码 ; 永久磁铁条码
magnet bar code 磁条码 ; 磁棒形码
Square magnet bar 方型磁棒
bar magnet 磁棒 ; 磁条 ; 棒磁铁
bar-magnet velocity meter 磁棒测速计
a bar magnet 一条磁铁
bar permanent magnet 条形永磁体
My 12 year old had a lesson in his science course later that day that mapped magnetic fields of a little bar magnet. He showed me the results.
当天的晚些时候，我12岁的大儿子在他的自然科学课上绘制了一幅磁铁的磁场分布图。他向我展示他的成果。
My 12 year old had a lesson in his science course later that day that mapped magnetic fields of a little bar magnet.
当天的晚些时候，我12岁的大儿子在他的自然科学课上绘制了一幅磁铁的磁场分布图。
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