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【单选题】
产业资本划分为货币资本、生产资本、商品资本的依据是资本各个部分:
A.
价值周转方式不同
B.
价值增值过程中的作用不同
C.
存在的物质形态不同
D.
在资本循环中的职能不同
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【单选题】电路如图所示,电流I为4. 5A,如果理想电流源断路,则I为多少?
A.
2.5A
B.
1.5A
C.
3A
D.
7.5A
【简答题】如图所示电路中,N为线性有源二端网络,测得A,B之间电压为9V,如图(a)所示;若连接如图(b)所示,可测得电流I =1A。现连接成图(c)所示形式,问电流I 为()A。【图片】
【简答题】如图所示电路,元件A的伏安特性为U=I 2 +1(I>0),求电流I和I 1 。
【简答题】听力原文:Every Roman town had a forum at its centre, where people came together to conduct their official and religious affairs. In addition, the forum was used as a meeting place. (83)
【简答题】Each town had its "fast" set which prided itself on its unconventionality... (Para.8)
【单选题】如图所示电路,电流I为(    )。
A.
-1A    
B.
3A    
C.
1A    
D.
0
【简答题】The town is famous for its magnificent church towers.
【简答题】某闭合电路中,电源的电压为定值,电流I(A)与电阻R(Q)成反比例,其图象如图所示,电流I与电阻R的函数关系式为______.
【单选题】This town is famous ______ its historical homes.
A.
for
B.
about
C.
with
D.
by
【单选题】Before the telephone was ______ , man had no way of talking to each other except face to face.
A.
invented
B.
discovered
C.
installed
D.
created
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