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A new technique for measurement of shielding efficiency is presented.
阐述了一种对屏蔽室屏蔽效能的测量技术.
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But construction cracks in massive concrete frequently occur, which leads to lower ray - shielding efficiency.
但大体积混凝土施工中常会产生施工裂缝, 以致降低了它防放射作用的效果.
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