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4. Income taxes (Details 2) ¥ in Thousands, $ in Thousands | Dec. 31, 2016 CNY (¥) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 CNY (¥) | Dec. 31, 2015 USD ($)
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The components of deferred tax assets are as follows: |  |  |  |
Tax losses |  | $ 838 |  | $ 1,159
Temporary differences |  | (2) |  | 1
Less: Valuation allowances |  | (650) |  | (958)
Net deferred tax assets |  | $ 186 |  | $ 202
ZHEJIANG TIANLAN |  |  |  |
The components of deferred tax assets are as follows: |  |  |  |
Tax losses | ¥ | ¥ 0 |  | ¥ 0 |
Allowance for doubtful debts | ¥ | 5,864 |  | 4,527 |
Net deferred tax assets | ¥ | ¥ 5,864 |  | ¥ 4,527 |

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