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【单选题】
直线l 、 l 互相平行的一个充分条件是( )
A.
l 、 l 都平行于同一平面
B.
l 、 l 与同一平面所成的角相等
C.
l 平行于l 所在的平面
D.
l 、 l 都垂直于同一平面
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