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【简答题】
在平面直角坐标系xOy中，O是坐标原点，等边三角形OAB的一个顶点为A（2，0），另一个顶点B在第一象限内。 （1）求经过O、A、B三点的抛物线的解析式； （2）如果一个四边形是以它的一条对角线为对称轴的轴对称图形，那么我们称这样的四边形为“”。点Q在（1）的抛物线上，且以O、A、B、Q为顶点的四边形是“，求点Q的坐标； （3）设△OAB的外接圆⊙M，试判断（2）中的点Q与⊙M的位置关系，并通过计算说明理由。
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