The principle of hard work is the use of a particular polarity of the magnetic particles to record data.
而硬盘的工作原理是利用特定的磁粒子的极性来记录数据。
The paper presents the scheme of integrated protection and introduces integrated protection system based on transient current polarity comparison principle.
提出了电力系统集成保护的方案，描述了一种基于暂态电流极性比较原理的多出线集成保护系统。
This paper has explained the manufacture principle of Al-flux-cored welding wire, and studied the technical characteristics of Aluminium alloy welding with straight polarity direct current TIG method.
阐述了药芯铝焊丝的制造原理，研究了TIG直流正接焊接铝合金的工艺特点。
In this paper, the existence theorem of midpoint chord of quadratic curve, as well as its proof, is given via methods of projective geometry and polarity principle.
文章利用射影几何方法及配极原理给出二次曲线中点弦存在性定理的证明。
Its principle is presented: the amplitude of initial traveling wave on faulty feeder is higher than those on other feeders and its polarity is in inverse.
介绍了单相接地故障行波选线原理，故障线路电流初始行波幅值最大，极性与非故障线路相反。
Its principle is presented: the amplitude of initial traveling wave on faulty feeder is higher than those on other feeders and its polarity is in inverse.
介绍了单相接地故障行波选线原理，故障线路电流初始行波幅值最大，极性与非故障线路相反。
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