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Short-term investments (Tables) | 6 Months Ended
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Jun. 30, 2025
Short-term Investments |
Schedule of Short term investments |
Schedule of Short term investments |  |  |  |  |  |  |  |  |
|  | December 31, 2024 |  |  | June 30, 2025 |  |  | June 30, 2025 |
|  | RMB |  |  | RMB |  |  | USD |
Marketable securities |  |  | 149,583,000 |  |  |  | 472,897,200 |  |  |  | 66,060,012 |
Schedule of Fair value disclosure |
Schedule of Fair value disclosure |  |  |  |  |  |  |  |  |  |  |  |
|  |  |  |  | December 31, 2024 |
|  | December 31, |  |  | Fair Value |
|  | 2024 |  |  | Level 1 |  |  | Level 2 |  |  | Level 3 |
|  | RMB |  |  | RMB |  |  | RMB |  |  | RMB |
Marketable securities |  |  | 149,583,000 |  |  |  | 149,583,000 |  |  |  | - |  |  |  | - |
|  |  |  |  | June 30, 2025 |
|  | June 30, |  |  | Fair Value |
|  | 2025 |  |  | Level 1 |  |  | Level 2 |  |  | Level 3 |
|  | RMB |  |  | RMB |  |  | RMB |  |  | RMB |
Marketable securities |  |  | 472,897,200 |  |  |  | 472,897,200 |  |  |  | - |  |  |  | - |

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- Definition Tabular disclosure of marketable securities. This may consist of investments in certain debt and equity securities, short-term investments and other assets. + References No definition available. + Details
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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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