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将正三棱柱截去三个角(如图1所示A,B,C分别是△GHI三边的中点)得到几何体如...
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将正三棱柱截去三个角(如图1所示A,B,C分别是△GHI三边的中点)得到几何体如图2,则该几何体按图2所示方向的侧视图(或称左视图)为( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231025452904768/SYS201311012310254529047005_ST/images1.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231025452904768/SYS201311012310254529047005_ST/images2.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231025452904768/SYS201311012310254529047005_ST/images3.png)
D.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231025452904768/SYS201311012310254529047005_ST/images4.png)
考点分析:
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一个圆柱的侧面展开图是一个正方形,这个圆柱的全面积与侧面积的比是( )
A.
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B.
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C.
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D.
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已知△ABC的平面直观图△A′B′C′是边长为a的正三角形,那么原△ABC的面积为( )
A.
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B.
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C.
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D.
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下列结论中,正确的有( )
①若a⊄α,则a∥平面α.②a∥平面α,b⊂α则a∥b.③平面α∥平面β,a⊂α,b⊂β则a∥b ④平面α∥平面β,点P∈α,a∥β且P∈a则a⊂α
A.1个
B.2个
C.3个
D.4个
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如图为一个几何体的三视图,其中俯视图为正三角形,A
1B
1=2,AA
1=4,则该几何体的表面积为( )
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231025452904768/SYS201311012310254529047001_ST/images0.png)
A.6+
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231025452904768/SYS201311012310254529047001_ST/0.png)
B.24+
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C.24+2
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231025452904768/SYS201311012310254529047001_ST/2.png)
D.32
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如图一个封闭的立方体,它6个表面各标出1、2、3、4、5、6这6个数字,现放成下面3个不同的位置,则数字l、2、3对面的数字是( )
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A.4、5、6
B.6、4、5
C.5、6、4
D.5、4、6
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