求翻译：由于上述各磁场均为矢量，要通过磁测唯一地得到钢管的人工磁化磁异常必须测量磁场在直角坐标系中的分量并且必须采用相对测量。是什么意思？

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Because of the above are for the magnetic field vector, it is necessary to adopt magnetic detection tube only to get the artificial magnetized magnetic anomaly must be measured at right angles in magnetic field coordinates the weight of the faculty and must adopt relative measurement.

Because the above various magnetic fields are a vector, and must only obtain the steel pipe artificial magnetization magnetism through the magnetic survey exceptionally to have to survey the magnetic field to have to use the relative measurement in rectangular coordinate system component.

Because each of these magnetic fields are vector, by magnetic measurement only is constructed of steel tubes-magnetization of magnetic anomalies must measure the magnetic field in rectangular coordinate system component and must be a relative measurement.