某焊缝试板作拉伸试验。焊缝的横截面尺寸为厚10mm,宽20mm,试样断面测量,断口面 发布时间:2017-08-14 13:52 │ 来源:www.tikuol.com 题型:问答题 计算题 问题: 某焊缝试板作拉伸试验。焊缝的横截面尺寸为厚10mm,宽20mm,试样断面测量,断口面积为160mm2,请计算焊缝试板断面收缩率是多少。
题型:问答题 计算题 — His sudden death surprised his wife. — It was so bad. His wife was surprised ____ his death. [ ]A. by B. withC. at D. on 查看答案