高斯投影是保持（）不变的投影。a. 角度b. 形状c. 长度d. 面积 - 查题网

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国家开放大学 / 水利工程测量

高斯投影是保持（）不变的投影。
a. 角度
b. 形状
c. 长度
d. 面积

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水利工程测量

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