【单选题】【消耗次数：1】
在RC桥式正弦波振荡电路中，当满足相位起振条件时，则其中电压放大电路的放大倍数必须满足（ ）才能起振。
①
AV = 1
②
AV = 3
③
AV ＞3
参考答案：
复制
纠错
相关题目
【判断题】
因为RC串并联选频网络作为反馈网络时的＝0°，单管共集放大电路的＝0°，满足正弦波振荡的相位条件＋＝2nπ（n为整数），故合理连接它们可以构成正弦波振荡电路。（）
①
正确
②
错误
【单选题】
在正弦振荡电路中，能产生等幅振荡的幅度条件是（）。
①
AF=1
②
AF1
③
AF1
④
<imgwidth="48"height="18"v:shapes="_x0000_i2164"src="http://wljy.whut.edu.cn:80/uploadfiles/word/mndzjs.files/image002.png">
随机题目
【单选题】
My camera can be ____ to take pictures in cloudy or sunny conditions.
①
treated
②
adjusted
③
adopted
④
remedied
【单选题】
With the help of the government , a large number of people ---_______ after the flood in 1991.
①
survived
②
suspended
③
suffered
④
suspected
【单选题】
A ____ is a person who ____ _____.
①
crime; commit; criminal
②
commit; criminal; crimes
③
commit; crimes; criminal
④
criminal; commits; crimes
【单选题】
The soldier was _____ of running away when the enemy attacked.
①
scolded
②
charged
③
accused
④
punished
【单选题】
The short story ____ the heart of the little boy with its unusual plot.
①
captured
②
cost
③
cast
④
chased
【单选题】
_____their differences,the couple were developing an obvious and genuine affection for each other .
①
But for
②
For all
③
Above all
④
Except for
【单选题】
Those acting for the defendant proposed to appeal ____ the sentence.
①
to
②
against
③
for
④
out
【单选题】
Which sport has the most expenses ____ training equipment, players’ personal equipment and uniforms?
①
in place of
②
in terms of
③
by means of
④
by way of
【单选题】
The pressure _____ causes Americans to be energetic, but it also puts them under a constant emotional strains.
①
to compete
②
competing
③
to be competed
④
having competed
【单选题】
We should make a clear ____ between the two scientific terms for the purpose of our discussion.
①
separation
②
discrimination
③
deviation
④
distinction