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小学四年级-三角形4-三角形的特性4 两点之间线段最短 距离
小学四年级-三角形4-三角形的特性4 通过生活中的例子说明2点之间所有的连线中线段最短，这条线段的长度叫做两点之间的距离。
小学四年级55/94
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