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【单选题】
发光二极管发光时,正向压降一般在 之间。A.
0.5～0 . 7V
B.
0.1～0.3V
C.
1.5～2 .5 V
D.
3.0～4.5V
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反馈参考答案：
举一反三
【单选题】They have opportunities to learn from professors they()would not be able to access.
A.
therefore
B.
or
C.
otherwise
【单选题】Many engineering professors may not have time to prepare material for class discussion on professional ethics.
A.
Right
B.
Wrong
C.
Not mentioned
【单选题】The passage implies that ______.
A.
different professors have different approaches to lecturing
B.
the purpose of a lecture is to impart information
C.
senior students do not attend as many lectures as freshmen
D.
a wide variety of subjects are covered in lectures
【简答题】某放大器想要增大输入电阻,则应该引入( )负反馈;某放大器想要减小输入电阻,则应该引入( )负反馈;
【简答题】Some senior professors have asked to retire so as to _______________ (为……腾出空间) the younger and more promising teachers.
【单选题】Several engineering professors have quit from teaching to protest against the creation of a new course in engineering ethics.
A.
Right
B.
Wrong
C.
Not mentioned
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