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如图,由几个小正方体组成的立体图形的左视图是( ) A. B. C. D.
如图,由几个小正方体组成的立体图形的左视图是( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101192737361615052/SYS201311011927373616150004_ST/images0.png)
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101192737361615052/SYS201311011927373616150004_ST/images1.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101192737361615052/SYS201311011927373616150004_ST/images2.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101192737361615052/SYS201311011927373616150004_ST/images3.png)
D.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101192737361615052/SYS201311011927373616150004_ST/images4.png)
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苏州市高度重视科技创新工作,全市科技投入从“十一五”初期的3.01亿元,增加到2011年的7.48亿元.请将7.48亿用科学记数法(保留两个有效数字)记为( )
A.7.48×10
8B.7.4×10
8C.7.5×10
8D.7.5×10
9
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![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101192737361615052/SYS201311011927373616150002_ST/images0.png)
解集在数轴上表示为如图所示的不等式组是( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101192737361615052/SYS201311011927373616150002_ST/0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101192737361615052/SYS201311011927373616150002_ST/1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101192737361615052/SYS201311011927373616150002_ST/2.png)
D.
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下列各式计算正确的是( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101192737361615052/SYS201311011927373616150001_ST/0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101192737361615052/SYS201311011927373616150001_ST/1.png)
C.2a
2+4a
2=6a
4D.(a
2)
3=a
6
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-
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101192737361615052/SYS201311011927373616150000_ST/0.png)
的倒数是( )
A.-
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101192737361615052/SYS201311011927373616150000_ST/1.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101192737361615052/SYS201311011927373616150000_ST/2.png)
C.-2
D.2
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将两块大小一样含30°角的直角三角板,叠放在一起,使得它们的斜边AB重合,直角边不重合,已知AB=8,BC=AD=4,AC与BD相交于点E,连接CD.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101192737361506263/SYS201311011927373615062024_ST/images0.png)
(1)填空:如图1,AC=______
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