通过与自由网平差结果对比表明，两种平差计算得到的单位权中误差相差不大，近似相等。
Compare to the free net adjustment result, these two unit weighted errors are closely approximated.
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人们看到的颜色来自物体差平芒的不直射。
People can see colors from the object on the reflection of light.
平的屋顶排水差。
A flat roof has poor drainage.
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