发布时间:2025-02-05 02:48:18
一平方公里就是一平方千米.是长和宽都是一千米的正方形面积,或者是面积为一平方千米的平面图形面积
朋友给了我一个石头说是什么玛瑙石但是不知道怎么把上面的东西处理掉请高手指点迷津
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