GB/T 34877.3-2017工业风机标准实验室条件下风机声功率级的测定第3部分:包络面法国家标准
英文:Industrial fans—Determination of fan sound power levels under standardized laboratory conditions—Part3:Enveloping sur...
英文:Industrial fans—Determination of fan sound power levels under standardized laboratory conditions—Part3:Enveloping sur...