题目内容

The city ______ great changes in the past five years.

A. sees
B. has seen
C. saw
D. had seen

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It is not long before the water ________cold.

A. is feeling
B. felt
C. was feeling
D. feels

有无穷多个向量组成的集合称为为向量空间。

A. 对
B. 错

v满足向量线性运算的全部8条运算规律则可以自成一个向量空间。

A. 对
B. 错

向量组的基就是v的极大无关组。

A. 对
B. 错