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【单选题】
下 列三极管各个极的电位,处于放大状态的三极管是( )A.
VC=8V ,VB=2.7V , VE=2V
B.
VC=10.3V , VB=10V, VE=10.7V
C.
VC=6V , VB=-3V , VE=0V
D.
VC=12V , VB=2V, VE=6V,
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【单选题】The 3-year-oid boy was found _____ in the bathroom. Nobody knows how and when he _____. [ ]
A.
dying, died
B.
dead, dying
C.
dead, died
D.
died, dying
【简答题】A 篇 "I sometimes get up at three or four in the morning and I surf the Internet." "I often check my e-mail forty times a day." "I often spend more than three hours during one time on the Interne...
【单选题】对下面的程序描述正确的是( )。 #include V oid main( ) { int x=3,y=5; if (x=y-4)printf( “ * ” ); else printf( “ # ” ); }
A.
有语法错误，不能通过编译。
B.
输出 *
C.
可以通过编译，但是不能通过连接，因而不能运行。
D.
输出 #
【简答题】The world’s population is increasing at an ever-fast rate, with severe consequences for the natural environment. For example, in there were 5.3 billion people in the world, or 93 million more tha...
【单选题】Jim is outside the room. Please open the door and ___________. [ ]
A.
let him in
B.
let in him
C.
let him out
D.
let out him
【单选题】He looks sad. Let’s cheer him up .
A.
let him down.
B.
Make him happy
C.
make him pleasure
D.
disappoint him
【简答题】"I sometimes get up at three or four in the morning and I surf the Internet." "I often check my e-mail forty times a day." "I often spend more than three hours during one time on the Internet." "I spe...
【单选题】如果三极管的发射结正偏,集电结反偏,当基极电流I B 增大时,将使三极管
A.
集电极电流Ic 减少
B.
集电极电压U CE 增大
C.
集电极电流Ic增大
D.
发射极电流I E 下降
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