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X-rays were first discovered by German scientist, Wilhelm K.Rontgen, in 1895, almost by accident.A./

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________ X-rays were first discovered by ________ German scientist, Wilhelm K.Rontgen, in 1895, almost by ________ accident.
A./, a,/B.The, a, anC.The, the,/D./, the, the在线课程A