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【单选题】
=(),其中L为曲线 + =-2yA.
0
B.
2
C.
4
D.
8
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【简答题】The famous American gorilla（大猩猩） expert Diane Fossey had a completely new way to study gorillas — she pretended to be one of them. She copied their actions and way of life — eating plants and getting ...
【单选题】稳压管的稳压功能通常是利用下列（）特性实现的。
A.
具有结电容，而电容具有平滑波形的作用
B.
PN结的单向导电性
C.
PN结的反向击穿特性
D.
PN结的正向导通特性
【单选题】稳压管的稳压功能通常是利用下列（ ）特性来实现的。
A.
具有结电容，而电容具有平滑波形的作
B.
PN结的单向导电性
C.
PN结的反向击穿特性
D.
PN结的正向导通特性
【简答题】One day when the famous American scientist Edison was on his way home, a young man stopped him and required to have a word with him. Edison accepted his request. The young man asked, “How, Mr. Edison,...
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