开水器采用步进式加热原理。
文末，对微波炉的加热原理及其安全性提出质疑。
In the end, give a query to the heating principle of microwave oven and its safety.
论述了高频电磁感应加热原理以及该技术在接装纸鼓轮加热中的实现。
The principle of high frequency electromagnetic induction heating and its application in cork drum heating were introduced.
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