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rad.

中文翻譯：

【醫】 根

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英文解釋：

名詞 rad.:

  1. a unit of absorbed ionizing radiation equal to 100 ergs per gram of irradiated material
    同義詞：rad
  2. the unit of plane angle adopted under the Systeme International d'Unites; equal to the angle at the center of a circle subtended by an arc equal in length to the radius (approximately 57.295 degrees)
    同義詞：radian, rad

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