GB/T 34877.1-2023工业风机标准实验室条件下风机声功率级的测定第1部分:通用要求国家标准
英文:Industrial fans—Determination of fan sound power levels under standardized laboratory conditions—Part 1: General over...
英文:Industrial fans—Determination of fan sound power levels under standardized laboratory conditions—Part 1: General over...