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【简答题】
In poem “mending wall”, the neighbor’s property is a representation of his privacy and the wall acts as a barrier against ____.
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参考答案：
举一反三
【多选题】How do you understand the meaning of “wall” in the poem?
A.
“wall” can also serve as a binder of the neighbors.
B.
“Wall” is present throughout the poem as an extended metaphor for the division that exists between the speaker and his neighbor.
C.
“wall” unites the speaker and his neighbor.
D.
“Wall” in the poem can refer to the wall-like structures in our life: fences, gates, boundaries, lines, etc.
【单选题】以下关于相干分析，说法错误的是：
A.
相干分析首先将信号拆分为不同频段的时间信号，再依次做相关分析
B.
当两个信号只是在某个频率段有很强的相关或共享振荡信号，而在其它频率并不相关，那么时间维度上，往往看不到它们的相关性
C.
相干分析可以帮助我们得到两个时间信号在特定频段的显著相关
D.
相干分析是指两个时间序列在相同频率段上对应的相关性
相关题目：
【多选题】How do you understand the meaning of “wall” in the poem?
A.
“wall” can also serve as a binder of the neighbors.
B.
“Wall” is present throughout the poem as an extended metaphor for the division that exists between the speaker and his neighbor.
C.
“wall” unites the speaker and his neighbor.
D.
“Wall” in the poem can refer to the wall-like structures in our life: fences, gates, boundaries, lines, etc.
【单选题】以下关于相干分析，说法错误的是：
A.
相干分析首先将信号拆分为不同频段的时间信号，再依次做相关分析
B.
当两个信号只是在某个频率段有很强的相关或共享振荡信号，而在其它频率并不相关，那么时间维度上，往往看不到它们的相关性
C.
相干分析可以帮助我们得到两个时间信号在特定频段的显著相关
D.
相干分析是指两个时间序列在相同频率段上对应的相关性
参考解析：
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