为什么qq直播课堂学生看不到麦克风图标，这是老师没开全麦吗，开全麦学生会不会显示麦克风或者其他图标？

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为什么qq直播课堂学生看不到麦克风图标，这是老师没开全麦吗，开全麦学生会不会显示麦克风或者其他图标？