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用双面标尺进行水准测量,前后视高差很小,在计算高差时,应以()符号为准。...
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三、四等水准测量,选用双面尺时,观测次序为后黑一前黑一前红一后红。()...
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测定同一条等高线上若干点来描绘等高线,称为()等高线。...
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