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【简答题】
4 给半导体 PN 结加正向电压时,电源的正极应接半导体的 区,电源的负极通过电阻接半导体的 区。(选:P,N,死,中间)
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举一反三
【简答题】利用 查询可以提高查询的通用性,用户只要输入不同的参数,就可以查出不同的结果。
【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】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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