音量限制：背景音乐由展览会组织者安排，展出者的声像设备的音量必须控制在不影响周围展出者的范围内。
Volume Limit: Background music, arranged by the exhibition organizers, exhibitors, audio-visual equipment, the volume must be controlled without affecting the surrounding exhibitors range.
音量限制：背景音乐由展览会组织者安排，展出者的声像设备的音量必须控制在不影响周围展出者的范围内。
Volume Limit: Background music, arranged by the exhibition organizers, exhibitors, audio-visual equipment, the volume must be controlled without affecting the surrounding exhibitors range.
应用推荐