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1. H
2. H-bomb
noun. a nuclear weapon that releases atomic energy by union of light (hydrogen) nuclei at high temperatures to form helium.
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3. km/h
noun. the ratio of the distance traveled (in kilometers) to the time spent traveling (in hours).
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5. H
noun. a nonmetallic univalent element that is normally a colorless and odorless highly flammable diatomic gas; the simplest and lightest and most abundant element in the universe.