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(Khác biệt giữa các bản)(New page: ===Noun=== =====a colorless, odorless, flammable gas that combines chemically with oxygen to form water: the lightest of the known elements. Symbol: H; atomic weight: 1.00797; atomic numbe...)(New page: ===Noun=== =====a colorless, odorless, flammable gas that combines chemically with oxygen to form water: the lightest of the known elements. Symbol: H; atomic weight: 1.00797; atomic numbe...)
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