A:(0,2)
B:(2,+∞)
C:(0,2)∪(2,+∞)
D:(0,+∞)
若直线l:ax+by+1=0(a>0,b>0)始终平分圆M:x2+y2+8x+2y+1=0的周长,则1a+4b的最小值为 ( )
I hurried to school without ________ breakfast.
小凡同学在做“观察水的沸腾”实验中