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Short-term loans (Tables)
12 Months Ended
Dec. 31, 2017
Convertible bonds [Abstract]  
Schedule of Short-term Debt
 
 
December 31,
 
 
 
2016
 
2017
 
 
 
RMB
 
RMB
 
 
 
 
 
 
 
 
 
Short-term loans
 
 
-
 
 
588,235