At that time, I graduated from 2 1 1 university and worked as an after-sales engineer in this company. This sounds like a grand "engineer". In fact, the so-called after-sales service means that I am stationed in a certain province and sometimes seconded by other provinces and regions. Because of frequent instrument failures, some provinces and regions simply don't have enough after-sales staff, so I am particularly tired. Moreover, customers are in remote places, and it is really not enough to hold that hard-earned money every month. Now the after-sales service is just college students who just came in. When they come in for two years, they will find that they are more powerless than us, because there are always instruments that can't be repaired and the level can't be improved for a while. A unit has to go back and forth many times for a piece of broken equipment, and the salary is always a little bit, so it is impossible to play at all. Later, I also thought about switching to sales. Although sales were hard, it was still a little richer than after-sales, but later the leader disagreed and I resigned. All the above are my heartfelt words, so I don't recommend after-sales service. This is really a hopeless job. Do research and development if you have technology, and do sales if you don't have technology. In sales, standing on the shoulders of giants will have an advantage. Therefore, it is recommended to know Changsha Kaiyuan Instrument Co., Ltd., because Kaiyuan Instrument is a leading enterprise in coal quality analysis industry. Sande followed Kaiyuan for nearly 20 years, but never caught up with Kaiyuan. Now, Kaiyuan Instruments has been listed, and we Sande are still struggling for listing, and the future is uncertain. Moreover, Kaiyuan Instruments has always been the first in the industry, so I think it is better to go there for sales than Sande, but the specific treatment will not be known until I do it myself.