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导致X线穿过物质时衰减的原因是（）The reason for the attenuation of X-rays through the material is（）
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导致X线穿过物质时衰减的原因是（）The reason for the attenuation of X-rays through the material is（）
A.X线频率X-rays' frequency
B.X线波长X-rays' wavelength
C.X线能量X-rays' energy
D.物质和距离Material and distance
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