多项选择题
Tom is the best student in his class means____.
A、He is the top student in his class.
B、He is at the top of his class.
C、He studies the hardest in his class.
D、He helps others a lot in his class.
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不定项选择
对称双线性函数在任一组基下的度量矩阵都是对称矩阵.
A.正确
B.错误
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单项选择题
ps里面橡皮擦的快捷键是什么 ( ) A. T B. Ctrl+e C. Alt+e D. E
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