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取两只易拉罐,用剪刀把其中一只易拉罐剪成几只宽为1厘米的金属圈备用,要求保持圈形圆整。实验时,先演示把一只金属圈套到完整的易拉罐上,因两者
Take two cans, use a pair of scissors to cut one of the cans into several 1cm wide metal rings for use. It is required to maintain a round shape. During the experiment, the first demonstration was to put a metal snare over a complete can, because both