1Cr18Ni9不锈钢和Q235低碳钢焊接,如两种母材熔化量相同,不加填充材料时,使 发布时间:2020-12-16 17:56 │ 来源:www.tikuol.com 题型:单项选择题 问题: 1Cr18Ni9不锈钢和Q235低碳钢焊接,如两种母材熔化量相同,不加填充材料时,使得焊缝得到()。A、珠光体组织B、马氏体组织C、铁素体组织D、奥氏体组织
题型:单项选择题 —Will you please give some advice on _______ English at home? —Well, do a lot of reading and listen to English program.A. how to read B. how to learn C. when to use 查看答案