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(2000•山西)下列命题中正确的是( ) A.平分弦的直径垂直于弦 B.圆心角...
(2000•山西)下列命题中正确的是( )
A.平分弦的直径垂直于弦
B.圆心角的度数等于圆周角度数的2倍
C.对角线相等且互相垂直的四边形是菱形
D.到两条平行线距离相等的点的轨迹,是和这两条平行线平行且距离相等的一条直线
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