Based on current concrete design criterion, a torsion stiffness formula for composite beams from the cracking stage to the limit stage was proposed for design reference.

基于现行硅结构设计规范，提出了组合梁从开裂到极限阶段抗扭刚度的计算公式，可供组合梁受扭设计参考。

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Very few terminations take place at this stage of pregnancy, but those in favour of keeping the limit as it is argue that it is often the 20 week scan which reveals severe abnormalities.

BBC: Q&A: Abortion law