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H3po4 h4p2o7 h2o. H4p2o7 структура. H4p2o7 получение. H2p2o4.
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P h s d s
P 1 3 p 1 8
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P c d t
P w h
P et
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P 0 8
P l w
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H3po4 h4p2o7 h2o. H4p2o7 структура. H4p2o7 получение. H2p2o4. 