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设m、n是不同的直线,α、β是不同的平面,有以下四个命题: ①若m⊥α,n⊥α,...
设m、n是不同的直线,α、β是不同的平面,有以下四个命题:
①若m⊥α,n⊥α,则m∥n;
②若α⊥β,m∥α,则m⊥β;
③若m上α,m⊥n,则n∥α;
④若n⊥α,n⊥β,则β∥α.
其中,真命题的序号是( )
A.①③
B.①④
C.②③
D.②④
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