1. Technicians younger than themselves can add the word "teacher" after their names, such as Zhang.
2. Technicians of the same age can be called by their first names, or added with professional titles, such as Zhang Gong and Gong Li.
3. For old technicians, you can call them by their first names or add their surnames, such as Wang Gong and Gong Liu.
In a word, we should pay attention to using polite and respectful tone when addressing technicians, and choose the appropriate address according to different scenarios.