抛物线y=（x-3）²+2的顶点坐标是(   )

    A long time ago，there was a craftsman．His name was Lu Ban. One day，he was at work on a mountain．A leaf cut his finger．He saw many sharp teeth on the leaf．"Could I make a____with teeth like these? I could cut things with it ____，"he said to____．Soon he made a saw. It was the first____in the world．People are____using this tool today．

在四边形中，若有一组对角都为90°，另一组对角不相等的四边形我们称它为“垂直”四边形，那么下列说法正确的序号是____ . (多填或错填得0分,少填酌情给分).
① “垂直”四边形对角互补；

②“垂直”四边形对角线互相垂直；
③“垂直”四边形不可能成为梯形；

④ 以“垂直”四边形的非直角顶点为端点的线段若平分这组对角,那么该“垂直”四边形有两组邻边相等.