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| ужесточение рентгеновского спектра (Medcyclopaedia.com : the phenomenon that a polychromatic X ray beam becomes more penetrating, or harder, as it traverses through matter.; пучка Pyotr) | |||
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| ужесточение рентгеновского спектра (Medcyclopaedia.com : the phenomenon that a polychromatic X ray beam becomes more penetrating, or harder, as it traverses through matter.; пучка Pyotr) | |||