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Resonance Tuning Fork 440HZ Teaching Tuning Fork 512HZ256HZ Hertz Acoustic Tuning Fork 512HZJ22001 Xiaodian
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Tuning Fork 512 56HZ Hertz Resonance Tuning Fork Resonance Communication of Pronunciation Gear Acoustic Experiment Presentation Sound
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Primary school science fourth grade tuning fork experimental material Standard Steel tuning fork 512Hz teaching aids dubbing hammer
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