Saturday, September 17, 2022
问题:在金属容器内焊接时,工作行灯的电压不得超过()。...
Saturday, September 17, 2022
问题:凡从是焊接与切割的作业人员只要经过一次安全培训,以后就不用再进行...
Tuesday, September 13, 2022
问题:在易燃、易爆、有毒、窒息等环境中,焊接作业前,必须进行()作业。...
Tuesday, September 13, 2022
问题:所谓乙炔自爆,通常是指乙炔并没有和其它气体混合而自行爆炸,产生纯...
Tuesday, September 13, 2022
Saturday, September 17, 2022
问题:发生回烧的气焊胶管不能继续使用应更换后使用()....
Tuesday, September 13, 2022
Saturday, September 17, 2022
问题:一般可燃物着火,可用()灭火器或清水扑灭。A、酸B、碱C、四氯化碳D、其他...
Wednesday, September 27, 2023
Tuesday, September 13, 2022
Saturday, August 19, 2023
问题:根据国际GB9488-88中的规定,氧气胶管为红色,乙炔胶管为黑...
Saturday, September 17, 2022
Tuesday, September 13, 2022
Tuesday, September 13, 2022
Saturday, September 17, 2022
问题:禁火区内动火,应按动火证规定的部位、时间动火,不准超越规定的范围...
Tuesday, September 13, 2022
Saturday, September 17, 2022
Saturday, September 17, 2022
问题:碳当量可以用来评定材料的()。A、耐腐蚀性B、焊接性C、硬度D、塑性...
Friday, November 4, 2022
问题:为保证保护接零的导线在发生短路时不熔断,其导电容量应离焊机最近处的保险丝额定电流的()。A、1.5倍B、2.5倍C、3倍D、4倍...
Monday, February 5, 2024