Magnetic attraction type electrical demonstration box junior high school physical adsorption type electrical optics demonstration box teacher version demonstration suit
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Hand-cranked generator detachable with fan scientific physics experimental equipment DIY technology manufacturing hand-cranked generator
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square coil elementary and middle school physics electromagnetism experiment equipment electromagnetic induction rectangular coil
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Metal hook combination junior and senior high school physical mechanics lever principle experiment combination hook metal hook
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Object conductive diode physical Electrical Experiment object conductive experiment material object conductive light emitting diode
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