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【简答题】
已知 NPN 型三极管的输入—输出特性曲线如图 所示,当 ( 1 ) U BE =0.7V , U CE =6V , I C = ? ( 2 ) I B =50μA , U CE =5V , I C = ? ( 3 ) U CE =6V , U BE 从 0.7V 变到 0.75V 时,求 I B 和 I C 的变化量,此时的
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皮皮学刷刷变学霸
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【简答题】It' s cold outside. You' d better__________your coat.
【单选题】Keep the door ______. It's too cold outside. [ ]
A.
closing
B.
closed
C.
to close
D.
open
【单选题】— It's cold outside. Put on your coat, ____ you may catch a cold. — OK, I will. [ ]
A.
and
B.
but
C.
or
D.
so
【单选题】It's very cold outside. You______ put on your overcoat.
A.
had better to
B.
would better to
C.
had better
D.
would better
【简答题】地貌旅游资源可以分为哪五大类?
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