Design and Evaluation of a Question-Answering System Based on Knowledge Graph-Augmented Large Language Models in K–12 Artificial Intelligence Curriculum. - Huang, Jingxiu; Lai, Feiyu; Zheng, Zixuan; Lai, Ruilin; Chen, Xingyu; Tian, Jun; Zheng, Yunxiang (Applied Sciences (2076-3417), 2026)