16k. A Book is a supplementary book for middle schools published by Tianjin People's Publishing House and edited by Zhang Liansheng. Yes 16k. It is a tutorial book on situational education, which we may not know much about. He is good at two things: the product is a collection of all subjects and all versions from the third grade of primary school to the third grade of high school; 20 13 Approved by the Ministry of Education and officially authorized by People's Education Publishing House, it became the only authorized unit in China. Especially the second one, although I don't know what's the use, but the only one in the country is still very dazzling.