GB/T 34877.2-2023 Chinese PDF (GB/T34877.2-2023)GB T 34877. 2 2023_Chinese: Industrial fans Determination of fan sound power levels under standardized laboratory conditions Part 2: Reverberant room method (Chinese: 2) Note Careful: Text of PDF is in Chinese (not English). Delivery (PDF in Chinese): 2 working hours typically, ASAP English versions: GB T 34877. 2 2023
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