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Pledged deposits (Narrative) (Details) - 3 months ended Mar. 31, 2018 | USD ($) | CNY (¥)
--- | --- | ---
Pledged Deposits 1 | $ | $ 1,343,488 |
Pledged Deposits 2 | ¥ |  | ¥ 8,430,792
Pledged Deposits 3 | $ | 1,000,000 |
Pledged Deposits 4 | ¥ |  | 6,300,000
Pledged Deposits 5 | $ | 32,626 |
Pledged Deposits 6 | ¥ |  | 200,000
Pledged Deposits 7 | $ | 300,000 |
Pledged Deposits 8 | ¥ |  | 1,900,000
Pledged Deposits 9 | $ | $ 1,343,488 |
Pledged Deposits 10 | ¥ |  | ¥ 8,430,792

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