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FAIR VALUE MEASUREMENTS (Changes in fair value of rate swap derivative) (Details)
9 Months Ended
Sep. 30, 2020
CNY (¥)
Sep. 30, 2020
USD ($)
Sep. 30, 2019
CNY (¥)
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Change in fair value of interest rate swap ¥ 78,878,089 $ 11,617,487 ¥ 94,440,241
Disposal (140,150,054)    
Interest Rate Swap [Member]      
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Balance at January 1, 61,271,965   12,786,001
Change in fair value of interest rate swap ¥ 78,878,089   94,440,241
Cash settlement     (21,488,548)
Balance at December 31,     ¥ 85,737,694