28.在平面直角坐標(biāo)系xOy中,對(duì)于線段AB和點(diǎn)C,若△ABC是以AB為一條直角邊,且滿足AC>AB的直角三角形,則稱點(diǎn)C為線段AB的“關(guān)聯(lián)點(diǎn)”,已知點(diǎn)A的坐標(biāo)為(0,1).
(1)若B(2,1),則點(diǎn)D(3,1),E(2,0),F(xiàn)(0,-3),G(-1,-2)中,是AB關(guān)聯(lián)點(diǎn)的有
;
(2)若點(diǎn)B(-1,0),點(diǎn)P在直線y=2x-3上,且點(diǎn)P為線段AB的關(guān)聯(lián)點(diǎn),求點(diǎn)P的坐標(biāo);
(3)若點(diǎn)B(b,0)為x軸上一動(dòng)點(diǎn),在直線y=2x+2上存在兩個(gè)AB的關(guān)聯(lián)點(diǎn),求b的取值范圍.