A:汉朝
B:唐朝
C:宋朝
D:明朝
—I an environmental report over the last few days, which should be submitted to the boss tomorrow.
(Ⅰ)求圆C的直角坐标方程;
(Ⅱ)设点为P(x,y)为直线l与圆C所截得的弦上的动点,求 3x+y 的取值范围.