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on request, on sale, on schedule, on second thoughts, on show, on the air, on the alert, on the analogy of, on the average, on the basis of,

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磁发电机, 磁放大器, 磁感应, 磁钢, 磁鼓, 磁轨, 磁化, 磁化率, 磁化系数, 磁极,