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X射线的穿透能力,与下列哪项无关 X-rays' penetration ability is independent of which of the following
A.物质的原子序数 Atomic number of the material
B.物质的厚度 Thickness of the material
C.射线的宽窄 Width of X-ray beam
D.射线的能量 Energy of X-rays
参考答案和解析
射线的宽窄
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