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如图,下列几何体的俯视图是右面所示图形的是( ) A. B. C. D.
如图,下列几何体的俯视图是右面所示图形的是( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101193716221441860/SYS201311011937162214418002_ST/images0.png)
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101193716221441860/SYS201311011937162214418002_ST/images1.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101193716221441860/SYS201311011937162214418002_ST/images2.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101193716221441860/SYS201311011937162214418002_ST/images3.png)
D.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101193716221441860/SYS201311011937162214418002_ST/images4.png)
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A.30°
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-3相反数是( )
A.
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如图,抛物线y=ax
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2+bx+c=0的两根x
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![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101193716221345797/SYS201311011937162213457023_ST/0.png)
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![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101193716221345797/SYS201311011937162213457023_ST/1.png)
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