直方图的平均值和标准差怎么算简介：Su Can didn't understand why he reached out his hand to shake Li Sisi's hand lightly, then quickly separated, and said politely, "My name is Su Can, and I'm also very happy to meet you."
Su Can didn't understand why he reached out his hand to shake Li Sisi's hand lightly, then quickly separated, and said politely, "My name is Su Can, and I'm also very happy to meet you."
