题目选项分析

Chinese public buildings erected under a construction code of the Sung dynasty have withstood earthquakes well because the white cedar used has four times the tensile strength of steel and the timber frame, incorporatingmany joints and few nails, is flexible.

Chinese public buildings erected under a construction code of the Sung dynasty have withstood earthquakes well because the white cedar that was used in them has four times the tensile strength steel has, and the timber frame, incorporatingmany joints and few nails, is flexible.