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数学课上,老师给大家出了这样一道题:下面是用4个棱长是1厘米的正方体拼接成的立体图形,你知道哪个图形的表面积最小吗?
In math class, the teacher gave everyone a question like this: The following is a three-dimensional figure spliced into a cube with 4 edges and 1 cm long. Do you know which figure has the smallest surface area?