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physical experiment equipment for Junior high school physical fixed resistance 5 ohm 10 ohm 15 ohm
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Resistance coil setting value 15 ohm resistance magnetic suction type electricity demonstration box teacher accessories
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5set Resistance coil setting resistance 5 ohm 10 ohm 15 ohm junior high school physics electrical circuit experimental equipment
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Junior high school physical fixed resistance 5 ohm 10 ohm 15 ohm unknown resistance physical electrical accessories
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