{"p":"can-20","op":"mint","tick":"can","amt":"1000","rows":[{"df":"qa","content":[{"q":"What should you do if you realize you have made a mistake during the process of upgrading a blockchain version?","a":"plan formulation: According to the characteristics and impact degree of the error, formulate corresponding repair plans. The plan should  include the problems that may be encountered in the repair process and countermeasures."}]}],"pr":"44ef896cbd0613aac01d94336fd946802a518d0a2cc6dcccb22c8106fbf9af24"}