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6. Accounts receivable, net (Details) ¥ in Thousands, $ in Thousands | Dec. 31, 2016 CNY (¥) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 CNY (¥) | Dec. 31, 2015 USD ($) | Dec. 31, 2014 CNY (¥)
--- | --- | --- | --- | --- | ---
Accounts receivable | $ |  | $ 4,431 |  | $ 4,557 |
Less: Allowance for doubtful debts | $ |  | (38) |  | (57) |
Net | $ |  | $ 4,393 |  | $ 4,500 |
ZHEJIANG JIAHUAN |  |  |  |  |
Accounts receivable | ¥ 91,069 |  | ¥ 99,864 |  |
Less: Allowance for doubtful debts | (32) |  | (32) |  | ¥ (131)
Net | 91,037 |  | 99,832 |  |
ZHEJIANG TIANLAN |  |  |  |  |
Accounts receivable | 204,166 |  | 238,325 |  |
Less: Allowance for doubtful debts | (39,066) |  | (30,418) |  |
Net | ¥ 165,100 |  | ¥ 207,907 |  |

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