系统通过下发（）消息，告知处于空闲态和连接态的UE，系统消息已经改变。
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根据《消费者权益保护法》第四张规定，该基本原则的内容是什么？
鞠躬礼源自日本，鞠躬时应正立、脱帽、微笑、目光正视、上身前倾15~30度。
A. 正确
B. 错误
一送多受轨道电路受端电压的调整要均衡，最多相差不能超过（）V为合格。
A. 0.2
B. 0.4
C. 0.6
D. 1
When is a first-hop redundancy protocol needed in the distribution layer？（）
A. when the design implements Layer 2 between the access arid distribution blocks
B. when multiple vendor devices need to be supported
C. when preempt tuning of the default gateway is needed
D. when a robust method of backing up the default gateway is needed
E. when the design implements Layer 2 between the access switch and the distribution blocks
F. when the design implements Layer 2 between the access and distribution block
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