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This gamma radiation is absorbed by atoms.
(真题)这种伽玛射线被原子吸收.
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Irons stony - irons chondrites and achondrites are by no means equally abundant among observed meteorites.
(真题)铁矿、陨铁石、球粒状陨石及无球粒陨石在可观测到的陨石中绝不多见.