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CNS 7779-4 - English Version
Industrial fans – Determination of fan sound power levels under standardized laboratory conditions – Part 4: Sound intensity method
工業用風機-在標準化實驗室條件下風機聲功率位準測定- 第4部:聲強度法 - 英文版
CNS 7779-3 - English Version
Industrial fans – Determination of fan sound power levels under standardized laboratory conditions − Part 3: Enveloping surface methods
工業用風機-在標準化實驗室條件下風機聲功率位準測定-第3 部:包絡面法 - 英文版

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