题目内容：
课堂结构包括课堂_________与课堂_________。参考答案：
答案解析：
填空题：课堂结构包括课堂_________与课堂_________。
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- 题目类型：填空题
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已知二次型的秩为2。(1)求a的值；(2)求f经正交变换化成的标准形．
已知二次型的秩为2。(1)求a的值；(2)求f经正交变换化成的标准形．
根据下列选项，请回答题：
根据下列选项，请回答题：
Commercial application of the research finding will be possi
Commercial application of the research finding will be possible if salad cream c
According to the researchers, cream sours faster than butter
According to the researchers, cream sours faster than butter because bacteria __
Fear should be used properly because __________
Fear should be used properly because __________ A．an airplane may crash on your