南南合作的主要形式不包括以下哪一种？

A research team is conducting a study on the effects of different types of feedback on second language learners’ writing performance. One group receives feedback that focuses solely on grammatical errors (error-focused feedback), while another group receives feedback that highlights both grammatical errors and strengths in their writing (balanced feedback). Assuming all other variables are controlled, which group is MOST likely to show greater improvement in their writing quality, taking into account motivational and learning principles?

Which of the following words is closest in meaning to 'stubborn'?

在二叉排序树中，节点的中序遍历结果是什么？

在稠密图G中，使用邻接矩阵存储时，若图中有m条边，邻接矩阵的存储效率如何？