正确答案: B

since

题目：IPv6 is currently in growing deployment around the world,() Internet address registries (RIRs) began to urge all resource managers to plan rapid adoption and conversion.

解析：B

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举一反三的答案和解析：

[单选题]电信服务质量是指（）

服务性能质量和网络性能质量

[单选题]LTE/EPC网络中，手机完成业务请求后，状态变为()

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