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若一个测站高差的中误差为m站，单程为ｎ个测站的支水准路线往返测高差平均值的中误差为（　　）

单选题
2021-07-17 23:35
A、nm站
B、n+m站
C、n-m站
D、<img alt="" src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/ueditor/jsp/upload/image/20190811/1565509314218078581_image.png" style="height:48px; width:118px" />
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正确答案
D
试题解析
标签： 测绘工程 专升本 测绘学基础 2019级第三学期期末考试
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