I will never know ________ whether I was encouraging or discouraging my children's interest in technical work by my example. A．in detail B．for fear C．for sure D．in place
As a young boy my family was very poor. I would often help do something for the neighbors to 16 a little pocket money. One day I 17 on the door of an elderly woman and
的图象与反比例函数
的图象在第一象限相交于点
，与
轴相交于点
轴于点
，
的面积为1，则
的长为 （保留根号）．
