Which statement describes the rule of split horizon?（）
A. Only router can split boundaries(horizons)between concentric networks.
B. All distance vector protocols require fall routes that may cause momentary loops as the topology changes.
C. Networks can only remain fully converged if all information about routes is sent out all active interfaces.
D. Information about a route should not be sent back in the direction from which the original update came.
Each AS must keep routing tables converged to prevent dead routes from being advertised across the AS boundary.
生产工艺岗位快开式隔膜压滤机司机，在压滤机工作过程中，应注意检查和发现什么问题？
《我与地坛》中，让读者联想到“我”艰难坎坷的人生道路和自强不屈精神的景物是（）。
A. “谁也不能改变”的落日光辉
B. 冬天雪地上孩子的脚印
C. 忧郁而镇静的苍黑古柏
D. “历尽沧桑”、“荒芜但并不衰败”的园子
在革命派和保皇派第二阶段的斗争中，分别于《民报》和（）为主要阵地展开激烈的论战。
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