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【单选题】
A class AB amplifier ( ).A.
conducts through 180° of the input waveform
B.
conducts between 180° and 360° degrees of the input waveform, depending on the amount of dc bias
C.
conducts through less than 180° of the input waveform
D.
works only with digital and pulsed waveforms
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举一反三
【单选题】All______ is a continuous supply of fuel.
A.
what is needed
B.
the thing needed
C.
that is needed
D.
for their needs
【单选题】I asked my teacher _______.
A.
what courses should I take
B.
should I take what courses
C.
I should take what courses
D.
what courses I should take
【简答题】What should be depended on to judge your reading speed? We should know what you are reading and your ______ in reading something.
【单选题】I'm not sure __________. [ ]
A.
what should I do
B.
what I should do
C.
how should I do
D.
how I should do
【单选题】精馏塔中由塔顶向下的第n-1、n、n+1层塔板，其气相组成关系为（）
A.
yn+1＞yn＞yn-1
B.
yn+1＝yn＝yn-1
C.
yn+1＜yn＜yn-1
D.
不确定
【简答题】精馏塔中由塔顶向下的第n-1、n、n+1层塔板,其气相组成的关系为( )。A. y n+1 >y n >y n-1 B. y n+1 =y n =y n-1 C. yn+1 nn-1 D. 不确定
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