【单选题】
以下哪些是EPC核心网网元SGW的功能?( )
A. SAE网络用户数据管理网元，提供鉴权和签约等功能，包含HLR功能；
B. SAE网络的边界网关，提供承载控制、计费、地址分配和非3GPP接入等功能，相当于传统的GGSN；
C. 负责无线资源管理，集成了部分类似2G、3G基站和基站控制器的功能；
D. LTE接入下的控制面网元，负责移动性管理功能
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答案
B
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【单选题】
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【单选题】
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【单选题】
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【单选题】
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【单选题】
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【单选题】
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【单选题】
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【单选题】
( ) 30. After the trip to the Arctic, Clarence Birdseye invented ____________.
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【单选题】
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【单选题】
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【单选题】
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【单选题】
( ) 34. Why did the father not ask his son not to do this and do that？
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A. A
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C. C
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【单选题】
( ) 35. What would someone learn from this passage？
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C．What a good father should do． D．What the self-important is like．
A. A
B. B
C. C
D. D
