电缆磁性记号作为测井射孔的深度标准，在油田勘探开发中占有极其重要的地位。
Logging cable magnetic mark, as the standard of perforating depth, lays an important role in the exploration and development of oilfield.
它允许用手写笔在用特殊磁性墨水打印的页面上做记号，同时显示在电脑屏幕上。
It would allow notations made with a stylus on a page printed with a special magnetic ink to simultaneously appear on a computer screen.
磁片中的磁性区域、电路中的电位差或是铅笔在纸上画出的记号都可以用来代表位元。
Bits can be represented by magnetic regions on disks, voltages in circuitry, or graphite marks made by a pencil on paper.
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