Sunday, January 14, 2024
Friday, August 18, 2023
Tuesday, September 13, 2022
Saturday, August 26, 2023
Tuesday, April 15, 2025
Tuesday, September 13, 2022
Tuesday, September 13, 2022
Friday, July 4, 2025
Saturday, January 25, 2025
Friday, August 18, 2023
Thursday, March 13, 2025
Wednesday, October 16, 2024
问题:卡扎里面密封的结构特点及其三种结构的适用范围是什么?...
Tuesday, September 13, 2022
Wednesday, December 11, 2024
问题:一般采用氩—氦混合气体保护焊时,混合气体的体积比例是氦()A、50%~60%B、70%~80%C、80%~90%...
Monday, August 5, 2024
Wednesday, June 28, 2023
Tuesday, September 13, 2022
Friday, February 23, 2024
Monday, June 10, 2024
问题:机械密封的故障在零件上主要表现有哪些?在运行中的表现有哪些?...
Tuesday, September 13, 2022