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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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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Besides, the depth of topmost geogrid to the width of strip footing is also greatly correlative to the safety factor, and the best ratio changes with the layers of geogrids.

此外，顶层筋材埋深与条基荷载宽度比值大小与边坡的安全性密切相关，其最佳比值随加筋层数不同而改变。

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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