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What do the first two digits of the postal code of the People's Education and Sports Bureau in the first volume of the third grade mathematics textbook mean?
The postal code of People's Education Publishing House is 10008 1, and the first two digits are 10, which stands for Beijing.

China's postal code adopts a four-level six-digit coding system, with the first two representing provinces (municipalities directly under the Central Government and autonomous regions), the third representing postal areas and the fourth representing counties (cities), and the last two representing the delivery areas in this city, that is, the location of the delivery areas.