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ультрачистый водород stresses
energ.ind.	ultra pure hydrogen (pure H2 (H2 purity ≥ 99.99%), high pure H2 (H2 purity ≥ 99.999%), ultra pure H2 (H2 purity ≥ 99.9999% MichaelBurov); ultrapurity hydrogen (MichaelBurov); ultrapure hydrogen (MichaelBurov)