The walls and ceilings of contemporary auditoriums usually conceal light, sound, and air-conditioningequipment.
当代观众厅的墙壁和天花板常设灯光、音响以及空调设备。
2
The noise coming from the air-conditioningequipment used by units or self-employed workers shall conform to the environmental noise standard for the locality.
单位和个体经营者使用空调设备产生的噪声，应当符合城市区域环境噪声标准；
3
The equipment includes plumbing, electrical wiring, hot water, and air-conditioning.