为什么说数学教育促进学前儿童主动性、独立性、任务意识和规则意识的发展？
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垄断竞争是一种比较接近现实经济状况的市场结构。
A. 正确
B. 错误
寡头垄断的市场结构比完全垄断更有利于技术进步。
A. 正确
B. 错误
What is the purpose of the spanning-tree algorithm in a switched LAN?（）
A. To provide a monitoring mechanism for networks in switched environments.
B. To manage VLANs across multiple switches.
C. To prevent switching loops in networks with redundant switched paths.
D. To segment a network into multiple collision domains.
E. To prevent routing loops in networks.
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