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RC-10 修改测量数据 2 It can be inferred from the passage that refraction would be most likely to cause errors in measurements of a mountain’s elevation under which of the following conditions? A. When there are local variations in sea level B. When light passes through humid air C. When theodolites are used relatively far from the mountain peak. （讨论答案，原文取非） D. When weather balloons indicate low air temperature and pressure. （GWD答案） E. When sea level has been carried in to within five to twelve miles of the summit. GWD-TN-24的版本已经修正答案为C了 | 
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发表于 2009-3-21 02:54:00
