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我的英国朋友詹姆斯·贾森(J.Jason …
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把一根线绳对折、对折、再对折,然后从对折 …
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小明有一根绳子,他将这根绳子对折、再对折 …
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现在我们看到的是印加帝国的一幢建筑物,从 …
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小明每天都会看到形状按下图所示顺序变化的 …
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圆周率小数点后的60位是: 3.1415 …
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