题目内容

There are hundreds of visitors________in front of the Art Gallery to have a look at Van Gogh’s paintings.

A. waited
B. to wait
C. waiting
D. wait

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He looked around and caught a man ______his hand into the pocket of a passenger.

A. put
B. to be putting
C. to put
D. putting

只含0向量的向量组没有极大无关组。

A. 对
B. 错

只含0向量的向量组没有极大无关组规定它的秩为零。

A. 对
B. 错

矩阵的秩等于列向量组的秩。

A. 对
B. 错