标准介绍
GB/T 21229-2007声学 风道末端装置、末端单元、风道闸门和阀噪声声功率级的混响室测定最新版内容查询,英语名称Acoustics - Determination of sound power levels of noise from air-terminal devices,air-terminal units,dampers and valves by measurement in a reverberation room,发布日期:2007-11-14,实施日期:2008-05-01,GB/T21229-2007声学风道末端装置、末端单元、风道闸门和阀噪声声功率级的混响室测定国家标准最新版免费下载
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