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三年级数学下册二《图形的运动》对称轴（二）拔高练习（无答案）北师大版.doc

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1对称轴（二） 1.规律填一填。2将一张正方形纸对折两次，剪出如图所示的小洞，展开后得到的图形是（ ） 。3.将一张正方形的彩纸沿着一条边对折 4 次后有多少条折痕？

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