What is the desk size of ordinary pupils?

Generally, there are desks of various sizes, including single desks and double desks. Generally, the desktop size of a single desk is 75cm× 130cm, and that of a double desk is 75CM×200cm. Considering the practicability and chair collocation, the height of the desk should be 750~80mm according to normal human physiology. Considering the activity area of the legs under the table, the clear height under the table is required.