Various deviation surveying , preventing and controlling systems used for continental scientific drilling and deep hole drilling in crystalline rock are collected and summed 收集和总结了主要科学钻探项目和结晶岩深孔取心钻探项目采用的钻孔测斜、防斜和纠(造)斜系统。
A Deviation surveymore generally known in the oil industry] as simply a 'survey', is the measurement of a [[borehole's departure from the vertical, measured in degrees (°).