【摘要】 对中学化学课堂演示实验的改进———注射器在演示实验中的作用进行探讨。通过改进 ,使现象更明显 ,学生更容易理解 ,效果比较理想。更多还原

【Abstract】 This paper has discussed the improvement of the demonstration of the chemistry class in middle school—the function of injectors in demonstration through the improvement phenomena become more obvious and easy to understand and the effect is comparatively ideal.更多还原