化工交流（Chemical Exchange）

为保证化工群内良好的环境,请在加入本群后,保证不在本群内发布与化工学习无关的信息,尤其是攻击他人,发布不良信息和广告等,对此我们将试情节严重程度给予处分！（the main purpose is exchange the chemical books in our group,and the main language are english and chinese,anyone who like chemical is welcome .And the advertisement is banned in this group .）

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