demonstrations:3_oscillations_and_waves:sound_waves:decibel_meter:start
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- 2013/04/10 13:53
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- 20130410_135337.jpg
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- ASCII è a xV4xV4xV4xV4 ` ± è¼ ÿÿËi ýý C A L ZDFE02 Cur.ZDFI02CML 018001001509FD0901090109010D010D010D090Dï %ë&