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【多选题】
设A为三阶方阵，则A满足（）时，|A|=0.A.
A 中有一列全为 0
B.
A 中有两列成比例
C.
A 为对称矩阵
D.
A 为反称矩阵
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反馈参考答案：
举一反三
【简答题】直线定线有 和 两种方法。
【单选题】According to the passage, ______ is the essence of self-plagiarism.
A.
the writer's pursuit for money or promotion
B.
the writer's laziness at his/her work
C.
the writer's deception on himself
D.
the writer's deception on the reader
【单选题】What is the writer's attitude towards Windows?
A.
The writer thinks it's time he quit using it.
B.
The writer thinks it is very good though it often breaks down.
C.
The writer dislikes it sometimes, but he can not live without it.
D.
The writer thinks highly of it.
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