本文论述了宽调速比直流电动机无火花换向区曲线分散的基本原因，并给出工程控制措施。
The paper introduces the basic cause of the sparkless space dispersion for DC motor with the wide adjustable speed ratio, and gives the control methods of projects.
他们也许会发现，除了可以发出那个短促的响声外，在玩具的一个管子里还有一个电灯按钮，一个可以播放音乐的键区，以及安装在一个管道内的换向镜。
They might discover that, as well as the squeaker, the toy had a button inside one tube which activated a light, a keypad that played musical notes, and an inverting mirror inside one of the tubes.
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