相对平均值计算公式

简介：The boys in the bookstore held their breath slightly, fearing that they would be over-breathed and frighten the two of them. When they heard Cheng Keshu inviting Su Xiaoxiao to go for a walk outside, their hearts were howling like wolves, take me, take me, of course. It was YY to a certain extent. In fact, Cheng Keshu's airiness was like a fairy, and Su Xiaoxiao's bright eyes and kind eyes made them ashamed.