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【单选题】
连续时间实信号【图片】是频率为300Hz、1.3kHz和4.3kHz的正弦信号的线性组合，现以2kHz采样频率对【图片】进行采样，恢复滤波器是截止频率为900Hz的理想低通滤波器，则通过恢复滤波器后输出信号中的各频率分量为__A.
300Hz
B.
300Hz, -300Hz
C.
300Hz, -300Hz, 700Hz
D.
300Hz, -300Hz, 700Hz, -700Hz
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【简答题】Part III Directions: In this section, you’ll hear some passages. At the end of each passage, you'll hear some questions. Both the passage and the questions will be spoken only once. After each questio...
【简答题】Part IV Directions: In this section, you’ll hear some passages. At the end of each passage, you'll hear some questions. Both the passage and the questions will be spoken only once. After each question...
【单选题】第15-17题图.docx The table in the above figure shows the levels of output resulting from different levels of inputs. Returns to scale are greatest at which level of output? ______
A.
100-200 units
B.
400-600 units
C.
200-400 units
D.
There is insufficient information to answer the question
【简答题】JAVA程序设计实例教程-比较3个以上数大小 参考PPT设计,写出运行代码,并上传截图
【简答题】下列有关弹性预算的说法正确的有（ ）。
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