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How to turn on the stereo in Wan 'ai Couple Hotel?

Ask the waiter to drive.

Hotel service personnel can turn on the hotel stereo. Audio refers to a set of audio system composed of electrical equipment. The development history of acoustic technology can be divided into four stages: electron tube, transistor, integrated circuit and field effect tube. Because of the high cost, it is not good to study it yourself, and it is not good to have a fault.