单词 | röntgen, wilhelm konrad |
释义 | Röntgen, Wilhelm KonradRöntgen, Wilhelm Konrad, Roentgen, Wilhelm Konrad (rent′gĕn, rönt′)RoentgenorRöntgen, Wilhelm Konrad(1845–1923) German physicist who discovered X-RAYS. A roentgen or röntgen is the quantity of X-rays or gamma radiation used as a unit of radioactivity. Symbol: R or r. |
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