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7. Prepayments and other current assets (Details) ¥ in Thousands, $ in Thousands | Dec. 31, 2016 CNY (¥) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 CNY (¥) | Dec. 31, 2015 USD ($)
--- | --- | --- | --- | ---
Cost and estimated earnings in excess of billings | $ |  | $ 343 |  | $ 144
Deposits paid | $ |  | 70 |  | 57
Prepayment | $ |  | 221 |  | 59
Other receivables | $ |  | 156 |  | 214
Other tax recoverable | $ |  | 25 |  | 26
Prepayments and other current assets | $ |  | $ 815 |  | $ 500
ZHEJIANG JIAHUAN |  |  |  |
Prepayments and other receivables | ¥ 11,994 |  | ¥ 13,039 |
Deposits paid | 3,448 |  | 4,433 |
Prepayments and other current assets | 15,442 |  | 17,472 |
ZHEJIANG TIANLAN |  |  |  |
Contracts costs incurred plus estimated earnings | 389,534 |  | 160,634 |
Less: Progress billings | (318,748) |  | (62,994) |
Cost and estimated earnings in excess of billings | 70,786 |  | 97,640 |
Prepayment | 24,100 |  | 13,828 |
Other receivables | 14,851 |  | 8,090 |
Other current assets | 1,320 |  | 0 |
Prepayments and other current assets | ¥ 111,057 |  | ¥ 119,558 |

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