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【简答题】
已知直线l过点P（0，2），斜率为k，圆Q：x 2 +y 2 -12x+32=0． （1）若直线l和圆相切，求直线l的方程； （2）若直线l和圆交于A、B两个不同的点，问是否存在常数k，使得 OA + OB 与 PQ 共线？若存在，求出k的值；若不存在，请说明理由．
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