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下图表示一个由相同小立方块搭成的几何体的俯视图,小正方形中的数字表示该位置上小立...
下图表示一个由相同小立方块搭成的几何体的俯视图,小正方形中的数字表示该位置上小立方块的个数,则该几何体的主视图为( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000142994806864/SYS201311030001429948068004_ST/images0.png)
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000142994806864/SYS201311030001429948068004_ST/images1.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000142994806864/SYS201311030001429948068004_ST/images2.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000142994806864/SYS201311030001429948068004_ST/images3.png)
D.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000142994806864/SYS201311030001429948068004_ST/images4.png)
考点分析:
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甲、乙、丙三个侦察员,从三个方位观察同一间房子,乙侦察员看到的是下图中的( )
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A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000142994806864/SYS201311030001429948068003_ST/images1.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000142994806864/SYS201311030001429948068003_ST/images2.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000142994806864/SYS201311030001429948068003_ST/images3.png)
D.
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下列四个几何体中,主视图、左视图与俯视图是全等图形的几何体是( )
A.球
B.圆柱
C.三棱柱
D.圆锥
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下图中,主视图和俯视图所对应的物体是( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000142994806864/SYS201311030001429948068001_ST/images0.png)
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000142994806864/SYS201311030001429948068001_ST/images1.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000142994806864/SYS201311030001429948068001_ST/images2.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000142994806864/SYS201311030001429948068001_ST/images3.png)
D.
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下图中,可能是圆锥的三视图的是( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000142994806864/SYS201311030001429948068000_ST/images0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000142994806864/SYS201311030001429948068000_ST/images1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000142994806864/SYS201311030001429948068000_ST/images2.png)
D.
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如图1,已知正方形ABCD的对角线AC、BD相交于点O,E是AC上一点,连接EB,过点A作AM⊥BE,垂足为M,AM交BD于点F.
(1)求证:OE=OF;
(2)如图2,若点E在AC的延长线上,AM⊥BE于点M,交DB的延长线于点F,其它条件不变,则结论“OE=OF”还成立吗?如果成立,请给出证明;如果不成立,请说明理由.
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