计算下期和值最准办法

简介：Li Xiangyun said that if you keep walking to the west, you can get out of the mountains and dense forests. Zhu Cihong believed her words, but it is not easy to identify the direction in the dense forests. It requires certain skills and knowledge and the sun as a reference. Zhu Cihong was Teacher, I have a superficial knowledge of all kinds of scientific knowledge, and I will put it to good use this time.