地磁日变基值的选取是海洋磁力测量地磁日变改正的重要内容。
The selection of base value is critical to the geomagnetic diurnal variation correction in Marine magnetic survey.
这样海洋壳就扮演了磁带的角色，记录下可以鉴定时 间的地磁场的历史。
The oceanic crust thus serves as a magnetic tape recording of the history of the geomagnetic field that can be dated independently;
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