A minimum of two safety switches must be installed on all progressive dies to probe for proper strip advancement and part out detection.

在扫数连续模中起码安置两个安定检测开关去检测料带是否精确送进以及产品是否脱落。

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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.

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。

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The roof shape optimization is one of the important means to control the ground pressure. A long strip of exposed roof surface shape can improve productivity of the stope and ensure mining safety.

优化采场顶板暴露面积形状是控制地压的重要手段之一，采用长条形顶板暴露面，能提高采场生产能力和保证回采的安全性。

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So-called runway incursions, or two planes mistakenly ending up on the same strip, "most likely account for the largest single safety problem in front of us, " said Mark Rosenker, another former safety board member.

WSJ: The New Frontier in Air Safety

Valarmadhy inches forward, using small tools to clear a strip 1m (40in) wide, digging down to 6in - the accepted safety depth - to ensure there are no mines between herself and the nearest visible mine.

BBC: The women clearing Sri Lanka's mines