rad /ˈræd/
弧度單位
Rad obs. imp. & p. p. of Read, Rede.
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rad
n 1: a unit of absorbed ionizing radiation equal to 100 ergs per
gram of irradiated material
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) [syn: radian]