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一个普通奶粉铁皮罐,只要在它的底部焊上一段金属管(图1),就能作十二个物理演示实验,而且效果很好。今介绍如下,供参考。
An ordinary milk powder tin can, as long as it is welded to the bottom of a piece of metal tube (Figure 1), can make twelve physical demonstration experiments, and it works well. This introduction is as follows, for reference.