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GB/Z 28820.3-2012 Long-term radiation ageing in polymers - Part 3: Procedures for in-service monitoring of low-voltage cable materials 420 (USD) via email in 1-3 business day VALID
GB/Z 28820.1-2012 Long-term radiation ageing in polymers - Part 1: Techniques for monitoring diffusion-limited oxidation 420 (USD) via email in 1-3 business day VALID
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