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| Standard Code | Standard Title | Standard Class | Order |
|---|---|---|---|
| GB/T 39465-2020 |
Card of smart city union—Interface for charging data 城市智慧卡互联互通 充值数据接口 |
China National Standards City union card |
 English PDF |
| GB/T 31778-2015 |
City union card of digital city—General technology requirements 数字城市一卡通互联互通 通用技术要求 |
China National Standards City union card |
English PDF |
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