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ting ting shi hou
Author(s): 
Pages: 37
Year: Issue:  12
Journal: Guided Reading for Primary School Students

Keyword:  盒子松香实验过程铅笔实验材料小孔模仿纸盒不同材料木盒;
Abstract: <正>下面向同学们介绍一个有趣的实验,用一个小盒子模仿狮吼或狗吠。实验材料:一个纸盒(木盒或白铁盒);一支铅笔;一段绳子;少许松香等。实验过程:1.在小盒的一边开一个小孔,然后把一支拴着一根绳子的铅笔塞入小孔中。用松香擦擦绳子,就像擦乐器的弓弦一样,使它
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