In part 3 particularly you can develop answers by including reasons, comparisons or personal____
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The key to improving fluency is to ____ using English in everyday communication as much as possible.
已知A为3阶实对称矩阵,则A的特征值可能是().
A. 1,2,i
B. 1,2i,-1
C. 2,3,1-i
D. 1,1,1
A检属于( )。
A. 深度功能检查
B. 中间检查
C. 大修
D. 基本检查