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A.①② | B.②③ | C.③④ | D.② |
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A.P∈a,a∥β | B.P∈a,P∉β | C.p∈a,a⊂β | D.a∩β=P |
A.若a∥α,b⊂α,则a∥b | B.若a∥α,b∥β,α∥β,则a∥b |
C.若a⊥α,b⊥β,α⊥β,则a⊥b | D.若a⊂α,b⊂α,a∥β,则α∥β |
A.若b⊂β,β⊥α,则b⊥α |
B.若b⊂α,c⊄α,b∥c,则c∥α |
C.若c⊥α,α∥β,则c⊥β |
D.c是a在β内的射影,b⊂β,b⊥a,则b⊥c |
A.l⊆α | B.l⊄α |
C.l∥α | D.以上都不正确 |
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