length measuring unit是什么意思

用法例句

Existing problem of friction pulley type length measuring unit for continuous caster flame cutting machine has been analyzed,and pinion and rack type length measuring unit has replaced the friction pulley type length measuring unit,good effect has been proved by production practice.

对连铸火焰切割机机体摩擦轮式测长装置在生产中存在的问题进了分析,并改用齿轮齿条式测长装置,经生产实践证明效果良好。