
BS EN 62489-1. Electroacoustics. Audio-frequency induction loop systems for assisted hearing. Part 1. Methods of measuring and specifying the performance of system components
出版:British Standards Institution

專家解讀視頻
BS EN 62489-1. Electroacoustics. Audio-frequency induction loop systems for assisted hearing. Part 1. Methods of measuring and specifying the performance of system components
出版:British Standards Institution
專家解讀視頻