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INVENTORIES (Details 1) - CNY (¥)
¥ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure Of INVENTORIES [Line Items]      
Carrying amount of inventories sold ¥ 443,382 ¥ 774,171 ¥ 748,778
Write down (reversal) of inventories 55,973 (2,733) 75,078
Cost of sales ¥ 499,355 ¥ 771,438 ¥ 823,856