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Acoustic Sensors and Actuators Chapter 7. Introduction Acoustics - “Sound” and its effects Frequencies - 0 to over 1 GHz Audio: 20Hz to 20 kHz Ultrasound:
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Unit 2 Welcome to Hong Kong Reading 2. Answer the questions. 1 Who visited Disneyland? 2 How did Kitty think of Hong Kong Disneyland? 3 What did they
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