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如图,水平放置的三棱柱的侧棱长和底面边长均为2,且侧棱AA1⊥平面A1B1C1,...
如图,水平放置的三棱柱的侧棱长和底面边长均为2,且侧棱AA
1⊥平面A
1B
1C
1,主视图是边长为2的正方形,则该三棱柱的左视图周长为( )
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101222720113471125/SYS201311012227201134711004_ST/images0.png)
A.8
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101222720113471125/SYS201311012227201134711004_ST/0.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101222720113471125/SYS201311012227201134711004_ST/1.png)
D.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101222720113471125/SYS201311012227201134711004_ST/2.png)
考点分析:
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②若l∥β,α⊥β,则l⊥α;
③若l⊥α,α⊥β,则l∥β.
其中正确的命题是( )
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B.①②
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![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101222720113327252/SYS201311012227201133272021_ST/0.png)
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![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101222720113327252/SYS201311012227201133272021_ST/2.png)
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