The electromagnetic attraction is pictured as being caused by the exchange of large Numbers of virtual massless particles of spin 1, called photons.
人们将“电磁吸引力”“描绘成”是由于“称作”“光子”的“无质量的”自旋为1的“粒子”的交换所引起的。
The revised schemes were designed basing on the original model features, and central planer coil structure was preferable by analyzing electromagnetic attraction force of movable contact.
基于已有模型的结构特点设计了电磁系统的改进方案，通过分析比较活动电极电磁吸力的分布规律，确定了中心平面线圈结构设计方案将更加合理。
The optimum design was realized associated with the relationship among coil turns, exciting current and electromagnetic attraction force.
结合线圈圈数、激励电流与电磁吸力之间的关系，完成了电磁系统的优化设计。
The optimum design was realized associated with the relationship among coil turns, exciting current and electromagnetic attraction force.
结合线圈圈数、激励电流与电磁吸力之间的关系，完成了电磁系统的优化设计。
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