算术平均值公式简介：Jiang Yuanliang was a little worried about the plague. After all, the spread of this thing was fatal. After it was discovered before Da Zhou, it was usually directly isolated and burned. Although it was cruel, it was very effective.
Jiang Yuanliang was a little worried about the plague. After all, the spread of this thing was fatal. After it was discovered before Da Zhou, it was usually directly isolated and burned. Although it was cruel, it was very effective.
