The magnetic directional system of logging tools used in the boreholetricomponent magnetic survey in CCSD main hole, is different from the directionalsystems that have been used.

• 在中国大陆科学钻探主孔进行井中三分量磁测所采用的是仪器自身的定向系统,该系统不同于一般的垂向和轴向定向系统。