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13、11671 DIV.Section1page: Section1DIV.MyFav_1279242211671 OLMARGIN-BOTTOM: 0cmDIV.MyFav_1279242211671 ULMARGIN-BOTTOM: 0cm【器材】空罐头盒(或纸杯)2个,细绳(58米)1根。【制作方法】(1)把两个罐头盒的盖子去掉,在盒(或纸杯)底中央分别钻上小孔。(2)再将细绳的两端分别穿入罐头盒(或纸杯)的小孔中并打上较大的结不让绳子从盒(或纸杯)底中脱落。【使用方法】拉直绳子后,一人对着罐头盒(或纸杯)轻轻讲话,让周围其他人听不见,另一人把罐头盒(或纸杯)对着耳朵就可以清楚地听到对方的声音。然后再两个人对调试验。【注意事项】(1)操作时绳子必须拉紧,并且中间不能触及其他物体。(2)罐头盒可取用易拉罐、小铁皮罐、盛冰淇淋的塑料杯或蜡纸杯、蜡纸筒端盖等。【备注】在课堂上表演时可请学生配合,或让相距较远的两位学生进行轻轻讲话,周围其他人听不见,只有对话的两个同学可以听见。课后可让学生利用易得材料自己动手制作和实验。
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