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【多选题】
用戴维宁定理计算下 图中的电流 I ,以下阐述正确的是:
A.
解题思路是:先将下面中的框内电路等效成右图中电压源,最后再计算I。
B.
计算开路电压,将电流源化成电压源,如下图。 计算: ,对Uoc和12V电源支路列KVL方程得: U OC =-2+12-6×2/3=6 (V)
C.
计算开路电压,将电流源化成电压源,如下图。 计算: ,对Uoc和6V电源支路列KVL方程得: U OC =-2+6-3×2/3= 2 (V)
D.
计算内阻的方法是,断开待求支路,对剩下的电路去源,然后计算两端的等效电阻,如下图,则Ro=Rab Ro=1-1+3//6=4Ω
E.
采用电源等效的办法计算开路电压和内阻: Uoc=2-8=-6V,Ro=1+1+2=4Ω
F.
经过计算,I=-1A
G.
经过计算,I=1A
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举一反三
【单选题】, : 包含 的闭曲线的值为
A.
1
B.
0
C.
-1
D.
2
【多选题】一般授权审批是对办理常规性经济业务的( )作出的规定。
A.
权力
B.
范围
C.
条件
D.
有关责任
【单选题】对于可视对讲系统,一般在住宅小区主要出入口的控制设备叫做?
A.
对讲主机
B.
对讲分机
C.
电控锁
D.
电源箱
【简答题】Ethanol, Schmethanol Everyone seems to think that ethanol is a good way to make cars greener. However , everyone is wrong. 1 Sometimes you do things simply because you know how to do. People have know...
【单选题】From the perspective of the poor, it seems obvious that the benefits would outweigh the costs. The benefits to poor people of no longer being poor would be enormous. Their intake of protein and other ...
A.
A rich businessman humiliates his poor fellow for not working hard.
B.
A worker beats a gentleman for his staring at his beautiful wife.
C.
A poor man murders another poor one just for his money.
D.
A president of a company sends a spy to another company to steal some information.
【单选题】子曰: “道之以政,齐之以刑,民免而无耻。道之以德,齐之以礼,有耻且格。”一句中,“道”指 ,“格”指 。
A.
方法;格式
B.
道路; 形式
C.
引导;自动纠错
D.
指导;格式
【单选题】People all over the world know Wimbledon as the center of lawn tennis. In 1874 it was a country village, but it was the home of the All England Croquet Club. The Club had been there since 1864. A lot ...
A.
a country village
B.
the home of an unusual croquet club
C.
the center of lawn tennis
D.
a famous place of interest near London
【单选题】设 为一条不过原点且不包含原点的光滑闭曲线,则 的值为( ).
A.
B.
C.
0
【简答题】甲、乙两同学想了解碳酸钾溶液的酸碱性.他们做了以下研究: [猜想与假设]碳酸钾溶液的酸碱性可能有______种情况; [设计与实验]用pH试纸来检测碳酸钾溶液的酸碱性: 实  验  操  作 检测结果 甲同学 取pH试纸放在玻璃片上; 用玻璃棒蘸取碳酸钾溶液沾在pH试纸上; 将试纸显示的颜色与标准比色卡比较. pH>7 乙同学 将pH试纸直接浸入碳酸钾溶液中,把试纸显示的颜色与标准比色卡比较. P...
【单选题】“道之以政,齐之以刑,民免而无耻;道之以德,齐之以礼,有耻且格。”出 自()
A.
《论语》
B.
《大学》
C.
《孟子》
D.
《中庸》
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