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【单选题】
如下图所示现象,三极管管脚从左到右排列1、 2 、 3 的顺序, 用万用表电阻进行测量 :当黑表笔测1脚时,红表笔测 2 脚时,指针偏转较大(约有几百欧姆电阻);当黑表笔测1脚时,红表笔测3脚时,指针偏转较大(约有几百欧姆电阻)。 根据以上现象, 该管子 是 ( ) 类型 三极管 的 。A.
NPN 型
B.
PNP 型
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举一反三
【单选题】直接调频与间接调频相比,以下说法正确的是 ( )
A.
．直接调频频偏较大，中心频率稳定
B.
．直接调频频偏较大，中心频率不稳定
C.
．间接调频频偏较大，中心频率不稳定
D.
．间接调频频偏较大，中心频率稳定
【单选题】What does the man's Morn do?
A.
The man's Morn works in a hospital.
B.
The man's Mom works in a restaurant.
C.
The man's Mom works at home.
【单选题】Man: What's the noise upstairs? Woman: It seems they're wrestling. Man:______.
A.
I can't stand it any more.
B.
I don't like it.
C.
What a shame.
D.
It's a storm in a tea cup.
【简答题】阅读理解。 St. Martin's Day is a holiday in Holland. St. Martin was a man who did kind things for many people in need. One cold winter day he was walking home. He wore a coat to keep warm and had a small p...
【单选题】What does the man know about St. Mary's Church?
A.
They have a beautiful organ.
B.
There will be a recital in the church.
C.
The church is a beautiful building.
【简答题】阅读理解。 St. Martin's Day is a holiday in Holland. St. Martin was a man who did kind things for many people in need. One cold winter day he was walking home. He wore a coat to keep warm and had a small p...
【单选题】What does the man know about St.Mary’s church?
A.
they have a beautiful organ
B.
there will be a recital in the church
C.
the church is a beautiful building
【单选题】设TTL异或门的输入端为A、B,若将其作反相器使用,则A、B端应 连接。
A.
A、B端并联在一起使用
B.
A或B端有1个接入低电平
C.
A或B端有1个接入高电平
D.
不能实现
【单选题】— — It’s May 1st.
A.
What day is it?
B.
What’s the date?
C.
What’s the time?
D.
What time is it?
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