Ladder feet are in good condition, e. g. rubber tips on metal rolling ladders. "Safe-Hi" feet on extension ladders.

梯子脚底是否有很好的止滑垫片。如金属梯子脚底的橡胶，延伸梯的防滑垫片。

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Introduced the principle, structure and operation mode of HS system in6 - hi cold rolling mill, and also set forth its important role in the control system of cold rolling mill.

介绍六重冷轧机上HS系统的原理、构及工作方式，阐述其在冷轧机控制系统中的重要作用。

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Introduced the principle, structure and operation mode of HS system in 6-hi cold rolling mill, and also set forth its important role in the control system of cold rolling mill.

介绍六重冷轧机上HS系统的原理、结构及工作方式，阐述其在冷轧机控制系统中的重要作用。

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