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【单选题】
下列调制，频带利用率最高的是（ ）A.
AM
B.
DSB
C.
SSB
D.
VSB
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反馈参考答案：
举一反三
【简答题】当= 时，分 式值为0．当 =____时，分 式 值为0．
【单选题】What is the purpose of the interview?
A.
TO make Doctor Cole well-known.
B.
To do some research on space technology.
C.
To introduce a new telescope.
D.
To report what has been discussed at an astronomy meeting.
【单选题】What will the FDA do before announcing its final decision?______.
A.
They'll do more research.
B.
They'll consider public opinion.
C.
They'll ask experts for advice.
D.
They'll wait for government's decision.
【单选题】Which of the followingbest describes the purpose of a sound program of educational research?
A.
To develop teaching theories．
B.
To avoid the harm of competition with research．
C.
To develop teaching techniques．
D.
To help professors improve competencies．
【单选题】Which of the following statements is NOT true about professor Sax's research?
A.
The research indicates that most students with only one Jewish parent will not think themselves as Jewish.
B.
The survey was carried out among Jewish Freshmen.
C.
The research survey didn't find out what and how these Jewish students think about their religion.
D.
The research presents a new perspective for the future study.
【单选题】What does the word 'that' stand for in the second paragraph?
A.
Brain activity.
B.
Her research findings.
C.
The fact that cell phone use may cause cancer.
D.
Her research progress.
【单选题】George Washington Carver ______ international fame for revolutionizing agriculture research in the southern United States during the early twentieth century.
A.
won
B.
winning
C.
who has won
D.
the winner of
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