然而，案例分析法存在两大严重的缺陷，它容易受到期望效应以及非正常个体的影响。
There are two serious problems with case studies — expectancy effects and atypical individuals.
资本定价是一门科学，也是一门艺术，具有相对性、时效性、模糊性和主观性等特征，并受到反馈效应和制度性缺陷的影响。
Capital pricing is both scientific and artistic, with the characteristics of relativity, timeliness, opaque and subjective, and is influenced by feedback effect and institutional defect.
主要是明显的尺寸效应和凝固、收缩、应力等问题，避免或减少铸铁井盖的成分偏析、变形、开裂等缺陷的产生。
Is mainly the size effect and solidification, shrinkage, stress and other issues clearly, to avoid or reduce the segregation, iron manhole cover deformation and crack defects.
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