已知 A 、 B 两点坐标分别为 A(4,2) 、 B (0,-2) , 则 直线 AB 的斜率 和倾斜角分别为( )
A.
1, 45 °
B.
- 1 , 135 °
C.
1 , 90 °
D.
不存在, 90 °
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