17.下列命题中是真命题的是( )
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| A. | 线段垂直平分线上的点到这条线段的两个端点的距离相等 | |
| B. | 有两边及一角相等的两个三角形全等 | |
| C. | 一个图形和经过它旋转所得的图形中,对应的所连的线段平行且相等 | |
| D. | 对角线相等的四边形是平行四边形 |