固定电话线或基于路由的前置作业时间。
本文件服务为指导， 甲骨文公司制造的前置作业时间。
This document serves as a guide to Oracle Manufacturing Lead times.
在油气井注水泥作业中，常常需要在水泥浆与泥浆之间注入一段具有特殊技术性能流体，这段流体就称为前置液。
During the primary cementing process, usually we pump some fluid with special technical performance between mud and cement slurries. It is called ahead fluid.
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