未分类题

教师—学生教学系统中，反馈信号是：

A.学生作业及考试成绩
B.学生答疑内容
C.学生给出的或提问的答案
D.老师授课内容
正确答案：学生作业及考试成绩；学生答疑内容；学生给出的或提问的答案
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