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What is the only authentic supporting cover of the master's original work?
Unit 2 development volume. The only authentic supporting cover of the master's original work is called the second unit development volume. Master's original work: Primary school mathematics is a book published by Jiangsu Education Press on 20 1 1. The author is a famous teacher's original writing group, sponsored by Hangzhou Education Bureau and Hangzhou Culture Radio and Television Group, assisted by Hangzhou Daily Newspaper Group and Hangzhou Huashu Digital TV Media Group, and undertaken by Hangzhou TV Children's Channel and Hangzhou Basic Education Research Office.