n.
Roentgen.adj.X射线的sp.=röntgen.roentgen
Noun
a unit of radiation exposure; the dose of ionizing radiation that will produce 1 electrostatic unit of electricity in 1 cc of dry air
German physicist who discovered x-rays and developed roentgenography (1845-1923)
roentgen例句
用作名词(n.)
William Roentgen discovered X-rays.
威廉
roentgen近义词
r rontgen
