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【单选题】
利用模拟滤波器设计IIR数字滤波器时，为了使系统的因果稳定性不变，在将转换为使s平面的左半平面映射到z平面的（）。A.
单位圆内
B.
单位圆外
C.
单位圆上
D.
单位圆与实轴的交点
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反馈参考答案：
举一反三
【多选题】下列关于边界层概念的说法中，正确的是()。
A.
边界层是指壁面附近流体黏性不能忽略的薄层
B.
边界层是指壁面不计流速梯度很大的薄层
C.
沿程水头损失与边界层的流动特点有关
D.
局部水头损失与边界层分离现象有关
【简答题】Look! There are many dark ___(cloud) in the sky.
【简答题】融合成髋骨的有:_______ 、_______ 和_______ 。
【单选题】EXERCISE_Finding the Topic Sentence of a Paragraph The following paragraph contains a topic sentence that states the main idea of the paragraph. Choose the sentence that best states the main idea. Thi...
A.
This was one of the worst situations I had ever been in.
B.
There was a tube in my nose that went all the way to the pit of my stomach.
C.
They had heard all kinds of tales about where the bullet struck.
D.
The bolder ones wouldn’t even bother to ask: they just snatched the cover off me and looked for themselves. In a few days, the word got around that I was in one piece.
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