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紫外线作用演示器
Ultraviolet effect demonstrator
价格：￥0.00
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红外线作用演示器
Infrared effect demonstrator
价格：￥0.00
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教学用电阻箱
Resistance box for teaching
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电子开关
Electronic switch
价格：￥0.00
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磁感线演示板(器)
The demonstrator for lines of magnetic induction
价格：￥0.00
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充磁器
Magnetizing assembly
价格：￥0.00
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教学音叉
Teaching tuning fork
价格：￥0.00
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圆柱体组
Cylinder suit
价格：￥0.00
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教学支架
Teaching stand
价格：￥0.00
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滚摆
Roll pendulum
价格：￥0.00
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