YDN 124-1999 Test spe4cifications for No 2 digital subscriber signaling system (DSS2) of broadband integrated service digital network (B-ISDN) Subscriber access.pdf

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YZ T 0159-2017 Specifications for express and manufacture service information exchange Part 1 Warehousing and distribution integration《快递服务制造业信息交换规范 第1部分 仓配一体化》.pdf

YZ T 0158-2017 Specifications for air transport information exchange of express item《快件航空运输信息交换规范》.pdf

YZ T 0157-2016 Basic data elements for express vehicles《快递车辆基础数据元》.pdf

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YZ T 0155-2016 Express item container Part 1 Container cage《快件集装容器 第1部分 集装笼》.pdf

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