upper yarn的意思|示意
美 / /
英 / /
正面纱
upper yarn相关例句
An approach is made into relationship between spinning aprons and yarn quality basing on the properties of the upper and lower aprons in spinning production.
针对细纱机用上、下胶圈在生产中的应用特点，探讨了胶圈与成纱质量的关系。