黄河三花间的洪水对下游防洪威胁严重，它的特点是什么？
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学校教育按社会对个体的基本要求对个体发展的方向与方面作出社会性规范，使个体社会化过程进入有意识状态。
A. 正确
B. 错误
砖应丁码成方垛，不得超高，距沟槽坑边不应小于（）防止坍塌。
A. 0.5m
B. 1m
C. 0.6m
With regard to bridges and switches, which of the following statements are true?（）
A. Switches are primarily software based while bridges are hardware based.
Both bridges and switches forward Layer 2 broadcasts.
C. Bridges are frequently faster than switches.
D. Switches typically have a higher number of ports than bridges.
E. Bridges define broadcast domain while switches define collision domains.
F. Both bridges and switches make forwarding decisions based on Layer 2 addresses.
解编操作时，主控动车组转换为调车模式后，必须一次移动多少米以上方可停车？
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