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GB/T 23146-2008
Calculation of frequency of twelve-tone equal temperament and cent
- 英文版
GB/T 18213-2000
Guide to the calculation of resistance of plain and coated copper conductor of low-frequency cables and wires
- 英文版
GB/T 14856-1993
Interference calculation methods of coast radiotelephone station operating in high frequency bands
- 英文版

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