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INVENTORIES
12 Months Ended
Dec. 31, 2017
Classes of current inventories [abstract]  
INVENTORIES
8.INVENTORIES

Inventories, net of provision for inventories, are summarized as follows:

    December 31,  
    2016     2017     2017  
    CNY     CNY     US$  
                         
Materials and supplies         8,437              
Finished goods      2,120              
      10,557