The technical problems of regulating balance are very common in physical experiment. The rule of dividing half and half is to quickly master the skills of regulating balance.
物理实验中常遇平衡调节的技术问题，对半法则是快捷地掌握平衡调节技巧的切实可行的方法。
It is a good method to learn physics via watching experiments, get twice the result with half the effort so it is necessary for us to research Physical demonstration experiment.
通过观察实验来学习物理是一条十分有效的学习途径，可以起到事半功倍的效果。因此，我们有必要对中学物理演示实验的教学进行研究。
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