Which of the following is not a contributory factor to thermoregulation in the preterm neonate

A. Immature central nervous system (CNS).
B. Large skin surface area.
C. Lack of subcutaneous (S. Ｃ. ) and brown fat.
D. Tendency toward capillary fragility.

某基础尺寸16m×32m，埋深4.4m，基底以上土的加权平均重度γ_m＝13.3N/m³，持力层为粉质黏土，γ＇＝9.0kN/m³，ψ_k＝18°，c_k＝30kPa，试用《建筑地基基础设计规范》（GB 50007—2002）的计算公式确定该持力层的地基承载力特征值。