用符号语言表示语句:直线a经过平面α外一点M .
考点分析:
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有四根长都为2的直铁条,若再选两根长都为a的直铁条,使这六根铁条端点处相连能够焊接成一个三棱锥形的铁架,则a的取值范围是( )
A.(0,
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)
B.(1,
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)
C.(
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,
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)
D.(0,
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)
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设α、β、γ是三个不重合的平面,l是直线,给出下列命题,其中正确命题的个数是( )
①若α⊥β,β⊥γ,则α⊥γ;
②若l上两点到α的距离相等,则l∥α;
③若l⊥α,l∥β,则α⊥β;
④若α∥β,l⊄β,且l∥α,则l∥β.
A.1个
B.2个
C.3个
D.4个
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在正方体ABCD-A
1BC
1D
1中,点P在线段AD
1上运动,则异面直线CP与BA
1所成的角θ的取值范围是()
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102024845632894/SYS201311031020248456328009_ST/images0.png)
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102024845632894/SYS201311031020248456328009_ST/0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102024845632894/SYS201311031020248456328009_ST/1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102024845632894/SYS201311031020248456328009_ST/2.png)
D.
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某三棱锥的三视图如图所示,该三棱锥的表面积是( )
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102024845632894/SYS201311031020248456328008_ST/images0.png)
A.28+6
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102024845632894/SYS201311031020248456328008_ST/0.png)
B.30+6
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102024845632894/SYS201311031020248456328008_ST/1.png)
C.56+12
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102024845632894/SYS201311031020248456328008_ST/2.png)
D.60+12
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若直线a⊥直线b,且a⊥平面α,则有( )
A.b∥α
B.b⊂α
C.b⊥α
D.b∥α或b⊂α
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