task rates meaning in English

工时成本计算

That task rates low on my priority list .
那件事情并不是我的当务之急。
Specially , in recent years , it has realized the roller change quickly and the main - drive system , the two level automation reformed successfully . on this condition , it realized the technology optimization , increased the task rate of unit and production quality , expanded the rolling kind and specification , and got the significant economic effects
特别是近几年来快速换辊和主传动系统、两级自动化改造成功,并在此基础上实现了工艺优化,使轧机作业率、产品质量有了明显提高,轧制品种和规格有了扩展,经济效益显著。