Magnetic drum Cylinder having a magnetic surface on which to store data.
有磁性表面，可贮存数据的圆筒。
On the Earth's surface where the magnetic declination is zero.
一条在地球表面上连接磁偏为零的点的假想线。
During the production of shell bodies, surface defects were found by magnetic powder inspection.
炮弹弹体生产中，磁粉检测发现表层缺陷。
During the production of shell bodies, surface defects were found by magnetic powder inspection.
炮弹弹体生产中，磁粉检测发现表层缺陷。
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