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REALIZED AND UNREALIZED FAIR VALUE (LOSS)/GAIN ON DERIVATIVE FINANCIAL INSTRUMENTS (Details) - CNY (¥)
¥ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Realized and unrealized fair value (loss)/gain on derivative financial instruments (Note 29(d)) ¥ 0 ¥ 0 ¥ 0