在托盘天平两边各放一只烧杯调节至平衡再�两只烧杯中各注入相同质量相同质最分数的稀硫酸然后按右图所示分别投入相同质量的锌粒和镁带反应 Template




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tomski在托盘天平两边各放一只烧杯调节至平衡再�两只烧杯中各注入相同质量相同质最分数的稀硫酸然后按右图所示分别投入相同质量的锌粒和镁带反应 coloring