古罗马时期的贺拉斯在（）中提出了后来影响久远的“寓教于乐”说。 ["《诗艺》","《镜与灯》","《理解媒介——人的延伸》","《诗格》"]
研究晕轮现象的意义
说明冯・诺依曼（Von Neumann）计算机的设计思想。
频率偏差超出50±0.5Hz时，应在（）分钟内恢复至50±0.5Hz。 ["10","15","20","30"]
Refer to the output shown on switch SW1 below： VLAN 1 bridge priority set to 8192. VLAN 1 bridge max aging time set to 20.VLAN 1 bridge hello time set to 2. VLAN 1 bridge forward delay set to 15. Switch is now the root switch for active VLAN 1. What command would you enter to reproduce this output？
论述建构主义学习理论及其对于我国基础教育改革的意义。
