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? Pwd=bq54 extraction code: bq54? Teaching-funded Chemistry | Breakthrough Course-Subject Knowledge and Teaching Ability -40 Video Handout of Junior Middle School Chemistry |zg|sx|ht| official website Contrast Chart | Courseware 0 1. Handout teacher qualification certificate middle school subject knowledge and ability unified examination-junior high school chemistry. Pdf| ninth lecture on material structure | eighth lecture on material structure | seventh lecture on common organic compounds of elemental compounds | sixth lecture on acid and alkali salts of elemental compounds. |