请回答: (1)材料中的“帝”指谁?他属于哪一个政权? ___________________________________________________________________________________________ (2)材料中的“北语”指哪个民族的语言? ___________________________________________________________________________________________ (3)上述材料反映了哪项改革内容? ___________________________________________________________________________________________ (4)本次改革在民族关系方面产生了什么作用? ___________________________________________________________________________________________ |