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Is Zhengzhou Yinda Elevator Company doing a good job in elevator after-sales maintenance?

I know this because we cooperate with Zhengzhou Yinda Elevator Company for elevator maintenance in our office building. Their company's maintenance work is quite good. Maintenance is done twice a month on time, with a 15-day cycle. The staff are also very attentive. Before the maintenance, the elevator is always cleaned. Since I started working with their company After cooperation, this phenomenon has almost disappeared. Can my answer help you solve the problem? If so, I hope you can adopt it