40mm Ring magnet a Pair of Students and Teachers Use Magnet Positive and Negative Electrode Cognitive Teaching Aids Teaching Instruments for Physical Experiments
40mm环形磁铁一对学生老师物理实验用磁铁正负极认知教具教学仪器
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Exchage Rate 1 CNY ≈ 0.1407 USD
Weight0.1 kg/piece
Stock num
1000 piece
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