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设l,m是两条不同的直线,a是一个平面,有下列四个命题: (1)若l⊥α,m⊂a...
设l,m是两条不同的直线,a是一个平面,有下列四个命题:
(1)若l⊥α,m⊂a,则l⊥m;
(2)若l⊥a,l∥m,则m⊥a;
(3)若l∥a,m⊂a,则l∥m;
(4)若ll∥a,m∥a,则l∥m
则其中命题正确的是 .
考点分析:
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