Since, at the time, there was no wind I could observe very distinctly and actually measure the displacement of the pieces of paper that were in the process of falling while the blast was passing.
因为在爆炸前，我清晰地观察到确实没有风造成飘落的纸片偏移。
This paper analysed the cause of falling roof, raised some methods of roof management, such as adjusting mineral blast, bolt support and prediction of roof caving. It ensured safety in mining.
本文分析了顶板冒落的原因，提出了顶板管理方法，如调整落矿工艺，顶板锚网支护和冒顶预测预报，结果保证了采矿的安全。
A novel, simple and reliable control method is presented to resolve reverse ruler and slackline problems caused by acceleration during falling down of stock rod in blast furnace.
为解决高炉探尺放尺过程中加速度所造成的倒尺和松绳问题，提出了一种新颖、简单、可靠的控制方案。
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