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Short-term borrowings (Details) - CNY (¥)
¥ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Short-term borrowings      
Short-term borrowings ¥ 0 ¥ 147,264 ¥ 200,000
Short-term borrowings      
Short-term borrowings      
Weighted average interest rate   4.15% 7.00%