________X-rayswerefirstdiscoveredby

发布时间：2020-07-10 05:12:28

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













A./, a,/












B.The, a, an











C.The, the,/











D./, the, the

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A
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