How about after-sales maintenance of excavators?

Thank you for your answer: Which company do you do after-sales service in Beijing? In the future, I suggest you find a master's task to learn from the teacher and ask: a small company is not worth mentioning. What can I learn from going to a big repair shop? Answer: Tell me which one. Is it in the Economic Development Wanjia Machinery City? Maybe I know that I can learn all the skills in the excavator of the overhaul factory, and I can earn more than 100 thousand a year when I come out to study. I can even ask: Beijing Xindali, what can I do when I come out? Answer: I have almost no ability to repair it myself, so I'd better find a master to repair the excavator. Question: I said what I learned in the maintenance workshop. what can I do? Answer: If you can maintain it independently, you can start your own business, or you can go to an excavator factory as an expert and ask: I think what you said is too idealistic. What business, excavator maintenance, people have after-sales service. How much is the after-sales salary? Answer: How many insured people are looking for after-sales service? The market is not small