Wednesday, July 5, 2023
Saturday, November 5, 2022
Friday, October 28, 2022
Monday, March 20, 2023
球铁管的表面缺陷可以()。A、不能影响使用B、可以修复C、可以焊补D、以上全部...
Wednesday, May 29, 2024
DN400管模的中期每次上机使用次数为200—300支。...
Wednesday, February 1, 2023
后期使用的管模,除进行必要的检查和修补外,要进行()。...
Monday, March 20, 2023
Sunday, September 11, 2022
Wednesday, May 29, 2024
管模埋弧焊接时,焊剂要充分()。A、预热B、烘干C、冷却D、加湿...
Wednesday, February 1, 2023
Sunday, September 11, 2022
Monday, September 12, 2022
Monday, September 12, 2022
球墨铸铁管的热处理一般分为加热、保温、()、缓冷四个阶段。...
Wednesday, July 5, 2023
Wednesday, May 29, 2024
Monday, September 12, 2022
Wednesday, May 29, 2024
Monday, September 12, 2022
球化孕育处理前,原铁水硅的含量为()。A、0.8~1.2%B、1.0~1.4%C、1.4~2.0%D、1.2~2.4%...
Tuesday, April 23, 2024
Sunday, August 13, 2023