如图所示,已知电源电压为6V,另外有三个电阻R1=15Ω、R2=25Ω、R3=1

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问题:

如图所示,已知电源电压为6V,另外有三个电阻R1=15Ω、R2=25Ω、R3=100Ω,请你用其中的两个电阻在图中虚线框内连成电路,使图中的电流表的示数为0.3A,要求画出电路图,并注明连入的电阻的阻值。

考点:电路图及元件符号
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建筑外门窗的安装必须牢固。在砌体上安装门窗严禁用()固定。

A、膨胀螺栓

B、水泥钢钉

C、射钉

D、燕尾铁角

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In one sense, we can trace all the problems of the American city back (91) a single starting point: we Americans don’t like our cities very much.
That is, on the (92) of it, absurd. After all, more than three-fourths of us now live in cities, and more are (93) to them every year. We are told that the problems of our cities are (94) more attention in Washington, and scholarship has discovered a whole new (95) in urban studies.
(96) , it is historically true: in the American psychology, the city has been a basically suspect institution, (97) with the corruption of Europe, totally lacking that sense of spaciousness and innocence of the (98) and the rural landscape.
I don’t pretend to be a scholar on the history of the city in American life. But my thirteen years in public (99) , first as an officer of the U. S. Department of Justice, then as Congressman, and now as Mayor of the biggest city in America have taught me (100) too well the fact that a p antiurban attitude (101) consistently through the mainstream of American thinking. Much of the (102) behind the settlement of America was in reaction (103) the conditions in European industrial centers and much of the theory (104) the basis of freedom in America was linked directly to the availability of land and the perfectibility of man outside the corrupt influences of the city.
What has this to do with the predicament of the modern city I think it has (105) to do with it. For the fact is that the United States (106) the federal government, which has historically established our national priorities, has simply never thought that the American city was "worthy" of (107) —at least not to the (108) of expending any basic resources on it.
Antipathy to the city predates the American experience. When industrialization (109) the European working man into the major cities of the continent, books and pamphlets appeared (110) the city as a source of crime, corruption, filth, disease, vice, licentiousness, subversion, and high prices.

A.profession

B.field

C.specialization

D.range

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前两天,国际著名的慈善家比尔盖茨退休了,留下了600亿美元的家产,全部用于慈善事业,对此你有何感想?

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原核生物中具有GTP酶活性的翻译起始因子是

A.IF1
B.IF2
C.IF3
D.eIF2

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加强指数法与积极型股票投资战略之间没有明显差别。()

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