Photos H2S O2

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H2s o2. H2s o2 катализатор. H2s o3. 2h2s+o2 2h2o+2s. H2+ h2s.
H2s o2 катализатор. H2s o3. 2h2s+o2 2h2o+2s. H2+ h2s.

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