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PREPAYMENTS AND OTHER CURRENT ASSETS (Activity in the allowance for credit losses) (Details)
 12 Months Ended
Dec. 31, 2020
CNY (¥)
Activity in the allowance for credit losses  
At beginning of year ¥ 0
Addition 5,568,242
At end of year 9,588,242
ASU No. 2016-13  
Activity in the allowance for credit losses  
At end of year ¥ 4,020,000