国际焊接协会认为,()是评定焊接接头层状撕裂敏感性的最好方法。...
Thursday, September 15, 2022
Friday, September 16, 2022
检测不锈钢表面裂纹的方法是()。A、超声波探伤B、磁粉探伤C、X射线探伤D、着色检验...
Thursday, December 15, 2022
按照钢中有害元素硫和磷的含量,可将碳素钢分为()钢、优质钢和高级...
Friday, September 16, 2022
Thursday, December 22, 2022
Sunday, September 11, 2022
企业的()应定期评审健康、安全与环境管理体系及其表现,以确保其适...
Sunday, September 11, 2022
Thursday, September 15, 2022
Friday, September 16, 2022
气体保护焊与其他电弧焊相比,缺点在于()A、不易实现机械化和自动化B、不利于焊工观察和操作C、工件的焊接变形太大D、室外作业需防风措施...
Wednesday, July 5, 2023
Tuesday, September 13, 2022
Thursday, September 15, 2022
Sunday, September 11, 2022
Saturday, September 17, 2022
Sunday, September 11, 2022
Sunday, September 11, 2022
气割厚14至20mm的钢板时,可选用G01-30型割炬。...
Thursday, September 15, 2022
焊缝尺寸符号是表示()和焊缝各特征尺寸的符号。A、间隙B、坡口面C、钝边D、坡口...
Thursday, December 22, 2022
Friday, September 16, 2022
()和氯、次氯酸盐等化合会发生燃烧和爆炸A、氮气B、氢气C、乙炔...
Monday, November 21, 2022