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云课堂中，本地播放视频无法听到声音？
• 检查本地触控一体机的扬声器是否静音。
• 检查本地触控一体机的音频播放设备，是否选择正确。
• 在易享课堂主界面，选择菜单【设置→音频输出→通话中音频输出】，勾选自动适配选项，系统会自动适
配通话中的音频播放设备。
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云课堂中共享视频时，本地和远端均无法听到声音？
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本地教学时，播放视频无声音？
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