... optical-coated abrasive 光学研磨材料(研磨布纸) Optical-magnetic Disk 磁性光碟、可读写光碟 optical-powder or grin abrasive 光学研磨材料(砥粒) ...
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Optical disk holds much more, data than many magnetic disks.
光盘能够存储比磁盘多得多的数据。
This paper is concerned with the principle of a non - contact optical instrument for measuring the surface roughness of a magnetic disk with an opto-heterodyne interferometer.
根据外差干涉计量术的原理，研制了非接触式的光外差干涉磁盘表面粗糙度测量仪。
Databases can be stored on magnetic disk or tape, optical disk, or some other secondary storage device.
数据库可以储存在磁盘或磁带，光碟或其他间接的存储设备上。
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