Mothers holding jobs outside the home should have ________ schedules to make it easier to care for their children. ( )
A:heavy
B:smooth
C:flexible
D:complex
我国水资源总量虽然位居全世界第六位,但仍是一个贫水国家,水危机离我们已越来越近。据此完成下列问题。
平面直角坐标系中,直线y=﹣ 12 x+2和x、y轴交于A、B两点,在第二象限内找一点P,使△PBO和△AOB相似的三角形个数为( )