170 QQ groups answer questions for students all day, and the customer service head teacher answers questions online
4hw.com.cn: there is no high number of evening self-study, which is not a perfect evening self-study... '@ Tan Yanxiang, teacher of Changsha University of technology, compiled mathematics into paragraphs to guide students in simple terms.
Mr. Tan is in charge of more than 170 QQ groups. 7x24 answers students' questions online. Students affectionately call him 'customer service' head teacher.