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【单选题】
如图所示,有一点电荷q位于两个互相垂直的半无限大接地导体板所围成的直角内,它到两个平面的距离分别为a和b,应用镜像法分析点电荷所在区域的电位,则下列陈述正确的是
A.
有一个点电荷,位N处,电量为-q
B.
有两个点电荷,分别位M和点N处,电量均为-q
C.
有三个点电荷,分别位M、点N和点P处,点M和点P处电量均为-q,点N处电量为q
D.
有三个点电荷,分别位M、点N和点P处,点M和点N处电量均为-q,点P处电量为q
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举一反三
【单选题】What is the news report mainly about?
A.
The importance of doing exercise for overweight men and women.
B.
The cause of obesity among middle-aged men and women.
C.
The effect of exercise on middle-aged, overweight men and women.
D.
The effect of lack of exercise on middle-aged men and women.
【单选题】_______important news report it is!
A.
What
B.
What a
C.
What an
D.
How
【单选题】What is the news report mainly about
A.
 The return of a bottled message to its owner's daughter.
B.
 A New Hampshire man's joke with friends on his wife.
C.
 A father's message for his daughter.
D.
 The history of a century-old motel.
【单选题】What is the news report mainly about?
A.
An American woman is kidnapped.
B.
An American woman survives an airstrike.
C.
An American woman is doing aid work.
D.
An American woman who has been kidnapped is dead.
【单选题】液压泵的选择首先是确定()。
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价格
B.
额定压力
C.
输油量
D.
结构型式
【单选题】液压泵的选择首先是确定()。
A.
价格
B.
额定压力
C.
输油量
D.
结构形式
【单选题】What is the news report mainly about?
A.
It is difficult to find a job during the recession.
B.
The STEM fields are the best choices for graduates.
C.
U.S. government has achieved a lot in employment.
D.
People can find jobs easier on the Internet.
【单选题】News Report Two 1. What is the peoblem of California?
A.
Shortage of water
B.
Too much rain
C.
High temperature
D.
Cold spell
【单选题】What's this news report focused on?
A.
Middle schools.
B.
Elementary schools .
C.
High schools.
【单选题】液压泵的选择首先是确定( )。
A.
价格.
B.
额定压力
C.
输油量
D.
D .结构型式
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