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【判断题】
采用相对调相可以解决在载波恢复中出现的相位模糊带来的问题。（ ）A.
正确
B.
错误
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举一反三
【简答题】How many students were shot dead in 1997 in US schools?
【简答题】l) In which year does the story take place? 2) How many students were there at Welton a hundred years ago? 3) How many students graduated in the first year? 4) How many students graduated last year? 5...
【单选题】听力原文：Students occasionally fail this course. Generally speaking, how many students fail this course?
A.
A few.
B.
Many.
C.
None.
D.
All.
【单选题】Two years ago, among those students looking for jobs before graduation, how many students could find one?
A.
20% of them.
B.
22% of them.
C.
40% of them.
D.
44% of them.
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