摘要: a b (1)a是平行线.b也是平行线.-------( ) (2)a和b互相平行.------------( ) (3)a和b都是平行线.-----------( ) (4)a和b是一组平行线.----------( ) (5)a是b的平行线.b是a的平行线.----( ) (6)a的平行线是b.b的平行线是a.-----( )
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