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Commitments and contingencies (Details) | Dec. 31, 2024 CNY (¥) | Dec. 31, 2024 USD ($) | Dec. 31, 2023 CNY (¥)
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Commitments and contingencies |  |  |
Total capital commitments | ¥ 157,801,809 | $ 21,618,759 | ¥ 397,421,757

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Balance Type: | credit
Period Type: | instant

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Namespace Prefix: | us-gaap_
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