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INVESTMENT PROPERTY - Additional Information (Details) - CNY (¥)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
INVESTMENT PROPERTY    
Investment property fair value used as deemed cost ¥ 37,253,000 ¥ 37,253,000
Increase decrease in impairment losses recognized in profit or loss transferred from property, plant and equipment ¥ 0 ¥ 4,858,000