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| Standard Code | Standard Title | Standard Class | Order |
|---|---|---|---|
| GB/T 34877.3-2017 |
Industrial fans—Determination of fan sound power levels under standardized laboratory conditions—Part3:Enveloping surface methods 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 |
China National Standards fans—Determination |
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