“horizontal directional drilling”的概念、定义、翻译、参考文献-科学参考

单词	horizontal directional drilling
释义	horizontal directional drilling Encyclopedia 工学掘进机械释 horizontal directional drilling水平定向钻将一个可调向操控的钻头连接在钻杆组的端部，用于地下水平定向钻孔的机具。是在不开挖地表面条件下，铺设多种地下公用设施（管道、电缆等）的施工设备，广泛用于供水、电力、电信、天然气、煤气和石油等管线铺设施工中。
随便看	variable water flow central air-conditioning system variable X-ray source variable γ-ray source variace-covariance matrix variance variance analysis variance analysis of one-way grouping data variance analysis of subgroup data in group variance analysis of two-way data variance-balanced block design variance between classes variance between clusters variance between laboratories variance component variance component model variance component models variance-covariance analysis variance-covariance component estimation variance-covariance matrix variance-covariance propagation law variance estimation variance functon variance inflation factor variance matrix variance of an estimator

科学参考收录了854744条科技类词条，基本涵盖了常见科技类参考文献及英语词汇的翻译，是科学学习和研究的有利工具。