How to control the slope deformation and stability became the key technical issue in the safe recovery of the hang-up wall ore.

如何控制边坡的变形与稳定构成了挂帮矿安全回收的关键技术问题。

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Sample preparation is a key technical issue for analyzing swipe samples and environmental samples with various characteristics by SIMS.

在用SIMS分析各种性质的环境样品和擦拭样品时，样品制备是关键性的技术。

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The transverse joint is a key technical issue in the construction of high-type bituminous concrete pavement, affects road surface evenness.

横接缝是高等级沥青混凝土路面施工中的一个比较关键性的技术问题，是影响路面平整度的重要因素。

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