另外，本文首次提出根据潜水水位曲线确定边坡几何形状的理论。
The theory of the phreatic water level confirms the slope form was first presented.
首次确定了国产抽油机的可靠性指标，并为提高抽油机的可靠性提出了改进意见。
The reliability index for home-made pumping units is determined for the first time and Suggestions for improving the reliability of pumping units are presented.
首次提出了根据屈服带宽度和条带煤柱宽度来确定条带开采安全系数的方法，同时给出了设计条带开采尺寸的步聚。
It is first raised that safety coefficient can be calculated by using the widths of yield zone and pillar, and the steps of designing the strip mining size are pro-posed.
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