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已知l,m是两条不同的直线,α,β是两个不同的平面,在下列条件中,能成为l⊥m的...
已知l,m是两条不同的直线,α,β是两个不同的平面,在下列条件中,能成为l⊥m的充分条件的是( )
A.α∩β=l,m与α、β所成角相等
B.l,m在α内的射影分别为l′,m′,且l′⊥m′
C.α∩β=l,m⊂β,m⊥α
D.α⊥β,l⊥α,m∥β
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