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【单选题】
周期性非正弦连续时间信号的频谱，其特点为A.
频谱是连续的，收敛的
B.
频谱是离散的，周期的
C.
频谱是连续的，周期的
D.
频谱是离散的，收敛的
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举一反三
【简答题】One should be moderate in all things. Moderation is always the safest way to do things, and a virtue we should have. Let’s take the student life for example. There are some students who study too hard...
【单选题】Which statement is NOT true?
A.
Students who work in the cafe earn a lot of money.
B.
At the same time they learn how to run business.
C.
They also get school credit.
D.
They give the money they earned to their school too.
【单选题】听力原文： (14)We've become alarmed over the health center by the number of students who are experiencing hearing loss. First, I want to go over some basics about hearing. Then we can take a look at our sc...
A.
Air pollution.
B.
Noise damage.
C.
Environment on campus.
D.
Solutions for pollution.
【单选题】_____ annoys the teacher most is that all the students are too quiet in class.
A.
What
B.
That
C.
When
D.
Who
【单选题】____ annoys the teacher most is that all the students are too quiet in class.
A.
What
B.
That
C.
When
D.
who
【单选题】听力原文： We've become alarmed over the health center by the number of students who are experiencing hearing loss. First, I want to go over some basic about hearing. Then we can take a look at our school ...
A.
Air pollution.
B.
Noise damage.
C.
Environment on campus.
D.
Solutions for pollution.
【判断题】According to the text, the students who complain about too much homework are eager beavers.
A.
正确
B.
错误
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