Electromagnetic Log is a relatively Log, and for single Log, the only measurement of the vertical ship relative speed of water, range, not conducive to the manipulation of large ships.
电磁计程仪是一种相对计程仪，且为单轴计程仪，只能测量船舶相对水的纵向航速、航程，不利于大型船舶的操纵。
A log similar to a dual induction log but made by an electromagnetic propagation tool built into a drill collar.
与双感应测井类似的一种测井方法，用安装在钻铤中的电磁传播仪进行测量。
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