Mum took _____ of the fine weather to do washing on Saturday morning.
A. chance
B. advantage
C. effect
D. interest
She was so _____ in reading the novel that she didn’t hear the bell ringing.
A. concentrated
B. absorbed
C. attracted
D. drawn
模拟信号放大器足完成对输入模拟量:
A. 幅度的放大
B. 频率的放大
C. 幅度和频率的放大
D. 低频成分的放大
设A是3阶实对称矩阵,P是3阶可逆矩阵,B=P-1AP,已知α是A佝属于特征值λ的特征向量,则B的属于特征值λ的特征向量是:
A. Pα
B. P-1α
C. PTα
D. (P-1)Tα