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v3.25.1

Accounts receivable, net (Details 1) | 12 Months Ended
--- | ---
Dec. 31, 2024 USD ($) | Dec. 31, 2024 CNY (¥) | Dec. 31, 2023 CNY (¥)
Credit Loss [Abstract] |  |  |
Beginning balance | $ 549,690 | ¥ 3,951,391 | ¥ 8,487,562
Addition |  |  | 3,951,391
Recovery | (549,690) | (3,951,391) |
Deconsolidation of Fe-da and subsidiaries |  |  | (8,487,562)
Ending balance |  |  | ¥ 3,951,391

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- Definition Amount of increase in allowance for credit loss on accounts receivable, from recovery. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-13 + Details
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