介绍一种以SCR作主开关器件的SPWM控制方式的变频调速系统，并通过实验对提出的方案进行了验证。
The paper presents a SPWM frequency variable and velocity variable system with SCR as main switching devices. The proposed scheme has been verified through experiment.
最新研究表明，它可能是控制机体积聚或燃烧脂肪的重要的主开关。
The latest research shows that it could be an important master-switch that tells the body whether to accumulate fat or burn it.
当要求进入电梯底坑的时候，必须首先打开控制柜中主开关IG，然后把安全杆转到工作位置；
When entering the elevator pit is required, firstly turn on the main switch IG in the control cabinet, and then switch the safety rod to the working position;
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