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What are the learning websites or QQ groups of the RFID electronic label industry to communicate
I just came into contact with this line, because I have to be responsible for the corresponding software development, so I am afraid that there are a lot of people in the middle. I want to ask people who are more experienced in this regard to communicate.
Who can analyze the reasons why there are many coal reserves in Jining area
Curious for a while, geographical knowledge, please answer carefully