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【单选题】
在编辑操作中,哪个命令是取消操作(undo)。( )A.
Ctrl+C
B.
Ctrl+V
C.
Alt+BackSpace
D.
Delete
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反馈参考答案：
举一反三
【简答题】DFT中旋转因子的固有性质有 _______ 。 N=2 M 点DIF-FFT共有 M 级运算,每级共有 ____ 个蝶形运算 利用 线性调频z变换 可以实现窄带信号频率分辨率的快速分析,对于系统辨识问题,当系统频率响应的极点远离单位圆时,用CZT可以准确的快速测定 ____ 。
【单选题】听力原文：W: Good morning, Mr. Tim. It's a long time since I had the pleasure of a visit from you. M: Yes, it must be three or four years. I haven't visited you since I called about my will. You helped me ...
A.
Haifa year.
B.
Two years.
C.
Three or four years.
D.
More than five years.
【单选题】Five years ago, David Smith wore an expensive suit to work every day. “I was a clothes addict(迷),” he jokes. “I used to carry a fresh suit to work with me so I could change if my clothes got wrinkled(...
A.
Company workers started to dress down about twenty years ago.
B.
Dress-down has become an everyday phenomenon since the early 1990s.
C.
“Dress-down Friday” was first given as a favor from employers.
D.
Many workers want to wear casual clothes to impress people.
【单选题】听力原文：W: Good morning, Mr. Tim. It's a long time since I had the pleasure of a visit from you. M: Yes, it must be three or four years. I haven't visited you since I called about my will. You helped me ...
A.
Half a year.
B.
Two years.
C.
Three or four years.
D.
More than five years.
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