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。
There are two types of Cold Rolling Mills operates, which are 6 hi Cold Rolling Mill and 4 hi Cold Rolling Mill.
有冷轧制造工厂工作的二类型，是6嗨冷轧制造工厂和4嗨冷轧磨工。
Structural characteristic of 20-hi rolling mill, roll configuration, working concept, the rolling force analysis, derivation and studying results are discussed this paper.
对20辊轧机构造特点、辊系配置、工作原理、轧制压力的分析、推导、计算进行了研究。
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