直线x+y+1=0的倾斜角与其在y轴上的截距分别是 ( )
A:135°,1
B:45°,-1
C:45°,1
D:135°,-1
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如图,△ABC是边长为4的等边三角形,△ABD是等腰直角三角形,AD⊥BD,平面ABC⊥平面ABD,且EC⊥平面ABC,EC=2.
(1)证明:DE∥平面ABC;
(2)证明:AD⊥BE.