It has been essential surveyingequipment and a good helper in electrical and communicational department and mineral company.
是电力、讯部门和厂矿企业不可缺少的设备和得力助手。
2
But nowadays tests for magnetotelluric surveyingequipment can not quantitative detect overall system and there is no uniform technical standards.
然而现行的大地电磁测深设备的检验办法既缺少整个系统的定量检测，也没有统一规范的技术标准。
3
At present, hole trajectory azimuth Angle is measured mainly with magnetism sensor, but which is restricted by magnetic field and the metal tube around the surveyingequipment.