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本文从理论、试验数据和实际工作中的问题出发对“SD 143-85”标准中规定的双壁单投影透照法相对灵敏度计算公式予以商榷,并提出了更合理的计算公式。
Based on the theoretical, experimental data and practical problems, the paper discusses the relative sensitivity calculation formula of “double-wall single-projection transillumination method” stipulated in “SD 143-85 ” standard and puts forward a more reasonable calculation formula.