... 观测的综合工作 observational synthesis 观测的平均寿命 observed mean life 观测的评权 weighting of observation ...
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By field observation and simulating test of shallow seam longwall mining, the phenomenon of main roof asymmetry breaking is discovered during the first weighting.
依据典型浅埋煤层工作面的实测和模拟，发现了采场老顶初次破断的非对称现象。
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