阶梯倍投最佳方案

简介：Seeing that it was almost time for lunch, Xiao Xiaobai had no intention of teasing the other inmates anymore. He just returned to the bed and sat down against the wall, preparing to close his eyes and rest for a while. There was a sound of the door opening, and the policeman who had just arrived outside came again, shouting into the cell: Xiao Xiaobai? Which one is Xiao Xiaobai? come out!