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He
Product indicators of pure helium, high-purity helium and ultra-pure helium (HE) :(GB/T4844-2011)App
Ne
Crude neon helium (NE/HE) product index: enterprise internal control quality standards
Kr
Product indicators of high-purity krypton and ultra-pure krypton (KR) :(GB/T 5829-2006) and quality
Xe