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Property, equipment and software, net | 12 Months Ended
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Dec. 31, 2017
Property, equipment and software, net |
Property, equipment and software, net | 11. Property, equipment and software, net Property, equipment and software, net, consist of the following:
|  | As of December 31, |
|  | 2016 |  | 2017 |
|  | RMB |  | RMB |
Electronic equipment |  | 3,779,766 |  | 7,172,694 |
Office equipment |  | 265,815 |  | 287,282 |
Vehicles |  | 1,091,556 |  | 1,164,376 |
Logistic and warehouse equipment |  | 1,578,653 |  | 2,693,969 |
Leasehold improvement |  | 493,765 |  | 827,408 |
Software |  | 175,418 |  | 203,848 |
Building and building improvement |  | 3,066,343 |  | 5,855,920 |
Total |  | 10,451,316 |  | 18,205,497 |
Less: Accumulated depreciation |  | (3,427,907 | ) | (5,631,319 | )
Net book value |  | 7,023,409 |  | 12,574,178 |
Depreciation expenses were RMB1,027,312, RMB1,751,086 and RMB2,310,065 for the years ended December 31, 2015, 2016 and 2017, respectively.

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- Definition The entire disclosure for long-lived, physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, accounting policies and methodology, roll forwards, depreciation, depletion and amortization expense, including composite depreciation, accumulated depreciation, depletion and amortization expense, useful lives and method used, income statement disclosures, assets held for sale and public utility disclosures. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI http://asc.fasb.org/topic&trid=2155823 + Details
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