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如图是一正方体被过棱的中点M、N和顶点A、D截去两个角后所得的几何体,则该几何体...
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102320117279710/SYS201311031023201172797004_ST/images0.png)
如图是一正方体被过棱的中点M、N和顶点A、D截去两个角后所得的几何体,则该几何体的主视图(或称正视图)为( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102320117279710/SYS201311031023201172797004_ST/images1.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102320117279710/SYS201311031023201172797004_ST/images2.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102320117279710/SYS201311031023201172797004_ST/images3.png)
D.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102320117279710/SYS201311031023201172797004_ST/images4.png)
考点分析:
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=(-2,1),
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=(λ,-1)(λ∈R),若
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的夹角为钝角,则λ的取值范围是( )
A.(-∞,-
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)
B.(-
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,+∞)
C.(
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D.(-
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个单位长度,再把所得图象上所有点的横坐标缩短到原来的
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A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102320117279710/SYS201311031023201172797002_ST/2.png)
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![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102320117279710/SYS201311031023201172797002_ST/5.png)
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![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102301226243279/SYS201311031023012262432020_ST/1.png)
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