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