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3. GB/T 25074-2010, Solar-grade Polycrystalline Silicon, National Standards of the People's Republic of China.
4. GB/T1557-2006, The Method of Determining Interstitial Oxygen Content in Silicon by Infrared Absorption, National Standards of the People's Republic of China.
5. GB/T 1558-2009, Test Method for Substituional Atomic Carbon Content of Silicon by Infrared Absorption, National Standards of the People's Republic of China.