题目内容

矩阵的初等变换包括

A. 初等行变换
B. 初等列变换
C. 数乘
D. A和B

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John, you must get your room ________ after breakfast.

A. to be cleaned
B. to clean
C. cleaning
D. cleaned

旋转变换、投影变换、和伸压变换都是线性变换

A. 对
B. 错

The problem _______ at tomorrow’s meeting is a very difficult one.

A. being discussed
B. discussed
C. to be discussed
D. to discuss

若同维向量a和向量b对应的分量相等,则a与b相等吗

A. 对
B. 错