A.①②③ | B.②③④ | C.②④ | D.④ |
A.①②③ | B.②③④ | C.②④ | D.①③ |
A.1 | B.2 | C.3 | D.4 |
A.若m∥α,α∩β=n,则m∥n |
B.若m⊥α,m⊥n,则n∥α |
C.若m⊥α,n⊥β,α⊥β,则m⊥n |
D.若α⊥β,α∩β=n,m⊥n,则m⊥β |
A.若a⊂α,b⊂β,且α∩β=l,则a∥b |
B.若a⊂α,b⊂β,且a⊥b,则α⊥β |
C.若a∥α,b⊂α,则a∥b |
D.若a⊥α,b⊥α,则a∥b |
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