【导读】
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1. [单选题]（ ）was frozen in December 2008 and this has been the basis for the first wave ofLTE equipment.LTE specifications are very stable，with and added benefit of enhancements having been introduced in all subsequent 3GPP Releases.
A. Release 1
B. Release 8
C. Release 10
D. Release 15
2. [多选题]电信网的软件包括网的（）以及技术体制、技术标准等。
A. 网路结构
B. 网内信令
C. 协议
D. 接口
