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... e faulty machines that are replaced but not repaired? This will increase the cost a lot."
"It doesn't add much." Chen Yang took a sip of water, sat in front of the mop chair, turned to look at her, and said with a smile, "Generally, the most frequent failure is that the keys don't work, or a certain part is out of order. The problem is, take it back and refurbish it, change the casing, and then refresh the system, and you can sell it as a new machine. Compared with setting up a maintenanc ...
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