“延伸率”用英语怎么说？

翼缘和腹板都有令人满意的延伸率 ( 即28% ).Both flange and web exhibited satisfactory elongation characteristics ( i . e . 28 % ).研究了对该膜强度和延伸率的影响因素.The several main factors of influences on strength and elongation. was analysed.柔性好, 高延伸率,...