When purchasing equipment, ensure the equipment has built in noisecontrol. For example, portable generator should have proper covers to reduce noise disturbance to the surrounding area.
购买设备时，确保建造的设备在噪声控制之内。如，便携式发电器应有罩子以降低对周围区域产生的噪声影响。
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The sound reduction hood is mainly used in gas turbine, steam turbine, air separation plant, air compressor, generator set and other large-scale equipment for noisecontrol.