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"Light and Shadow" Light PPT Courseware
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Blue abstract starlight stars PPT background image
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"Light and Shadow" Light PPT Courseware 2
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"Hazards and Control of Noise" Acoustic Phenomenon PPT Courseware 7
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"Hazards and Control of Noise" Acoustic Phenomenon PPT Courseware 7
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"The Generation and Propagation of Sound" Sound Phenomenon PPT Courseware 4
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