The size of the card in the slot of the school information bulletin board.

It's usually this size, just refer to the size of cards such as bank cards and ID cards.

School (English: school) refers to an organization in which educators systematically carry out educational activities for the educated in a planned and organized way. The name originated in the Republic of China. The school is a purposeful, systematic, organized and planned social activity conducted by full-time staff and specialized institutions. The direct purpose is to influence the physical and mental development of the educated, and finally make the physical and mental development of the educated reach the predetermined goal. School education refers to all kinds of education received by the educated in various schools and is an important part of the education system. The specific activities of school education are influenced by social demand, so it must conform to the trend of social development and undertake the function of conveying talents to society. Generally speaking, school education includes primary education, secondary education and higher education. Schools are mainly divided into five types: kindergarten, primary school, junior high school, high school and university. In 20 16, there were 5 12000 schools at all levels in China, with a total construction area of 3.26 billion square meters.